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TIME SPEED AND DISTANCE
The formula for speed is speed = distance ÷ time. To work out what the units are for speed, you need to know the units for distance and time. In this example, distance is in metres (m) and time is in seconds (s), so the units will be in metres per second (m/s).
Speed, Time & Distance Conversions

To convert from km / hour to m / sec, we multiply by 5 / 18. So, 1 km / hour = 5 / 18 m / sec

To convert from m / sec to km / hour, we multiply by 18 / 5.
Source: Safalta.com
So, 1 m / sec = 18 / 5 km / hour = 3.6 km / hour 
Similarly, 1 km/hr = 5/8 miles/hour

1 yard = 3 feet

1 kilometer= 1000 meters = 0.6214 mile

1 mile= 1.609 kilometer1 hour= 60 minutes= 60*60 seconds= 3600 seconds

1 mile = 1760 yards

1 yard = 3 feet

1 mile = 5280 feet

1 mph = (1 x 1760) / (1 x 3600) = 22/45 yards/sec

1 mph = (1 x 5280) / (1 x 3600) = 22/15 ft/sec
For a certain distance, if the ratio of speeds is a : b, then the ratio of times taken to cover the distance would be b : a and vice versa.
How to Calculate Average Speed ?
Often calculating the average speed is simple using the formula
Speed=Distance/Time
However, you may be given two alternative speeds to utilise for separate periods of time or across various distances.
Other formulae for calculating the average speed exist in these cases.
These sorts of issues may be useful in real life, and they frequently arise on standardised examinations, so learning these formulae and procedures is beneficial.
Relationship Between Speed, Time & Distance
 Distance/Time = Speed — This shows us how fast or slow an item moves. It is defined as the distance travelled divided by the time it took to travel that distance.
 Distance is directly proportional to speed, but time is inversely proportionate. As a result, Distance = Speed X Time, and Time = Distance / Speed, the time taken will reduce as the speed rises, and vice versa.
 Any simple problem may be addressed using these formulae.
However, while utilising formulae, it's also crucial to remember to use the right units.
Speed, Time, and Distance Tricks
Now, we come across time speed and distance on a daily basis, but we don't really think about the relationship until we put it to the test.
If you drive to work at 4 km/hr, you will arrive 20 minutes late; if you drive at 6 km/hr, you will arrive 10 minutes early.
Isn't that easy? Competitive tests, on the other hand, manage to perplex us by translating kilogrammes to metres or centimetres, and hours to seconds and milliseconds.
QUESTIONS AND ANSWERS:
Question 1:
A moving train crosses a man standing on a platform and a bridge 300 meters long in 10 seconds and 25 seconds respectively. What will be the time taken by the train to cross a platform 200 metres long?
Option 1: 25sec
Option 2: 22sec
Option 3: 20sec
Option 4: 28 sec
Answer: 3: 20sec
Question 2:
The ratio of length of two trains is 5:3 and the ratio of their speeds is 6:5 . The ratio of time taken by them to cross a pole is?
Option 1: 25 : 18
Option 2: 23:18
Option 3: 18:25
Option 4: 25:17
Answer: 1: 25 : 18
Question 3:
A train passes two bridges of lengths 800 m and 400 m in 100 seconds and 60 seconds respectively. The length of the train is?
Option 1: 180mm
Option 2: 200mm
Option 3: 120mm
Option 4: 250mm
Answer: 2: 200m
Explanation: In both cases, the speed of the train is constant, and then we have 100/60=(x+800)/(x+400) 100(x+400)=60(x+800) x=200m
Question 4:
The length of a train and that of a platform are equal. If with a speed of 90 km/hr the train crosses the platform in one minute.?
Option 1:720 mm
Option 2:700mm
Option 3:750mm
Option 4:780mm
Answer: 3: 750m
Explanation: Let length of both train and platform = x.
Distance covered by the train to cross the platform = x + x = 2x Time = 1 min = 60 sec and speed = 90 km/h 90×5/18=25m/s Therefore, Distane = Speed×Time 2x = 25 x 60 x = 750 m
Question 5:
Gautama covers a distance of 160 km at a speed of 32 km / h and then returns at a speed of 40 km / h. What is the average speed of Gautam?
Option 1: 72 km/h
Option 2: 71.11 km/h
Option 3: 36 km/h
Option 4: 35.55 km/h
Answer: 4: 35.55 km/h
Explanation: Total time taken in complete travelling = 160/32+160/40= 9 hour So, The average speed of Gautam = 160 + 160 9 = 35. 55 km/h.
Question 6:
A farmer travelled a distance of 61 km in 9 hrs. He travelled party on foot at the rate of 4 km/hr and party on bicycle at the rate of 9 km/hr. The distance travelled on foot is—
Option 1: 17 km
Option 2: 16 km
Option 3: 15 km
Option 4: 14 km
Answer: 2: 16 km
Question 7:
Walking at the rate of 4 kmph a man covers certain distance in 2 hrs 45 min. Running at a speed of 16.5 kmph the man will cover the same distance in how many minutes ?
Option 1: 35 min
Option 2: 40 min
Option 3: 45 min
Option 4: 50 min
No answer is set
Explanation: When distance is constant, then speed is inversely proportional
Question 8:
Two trains of lengths 150 m and 180 m respectively are running in opposite directions on parallel tracks. If their speeds be 50 km/hr and 58 km/hr respectively, in what time will they cross each other ?
Option 1: 30 sec.
Option 2: 15 sec.
Option 3: 22 sec.
Option 4: 11 sec.
Answer: 4: 11 sec
Question 9:
Two trains start at the same time from Aligarh and Delhi and proceed towards each other at the rate of 14 km and 21 km per hour respectively. When they meet, it is found that one train has travelled 70 km more than the other. The distance between two stations is
Option 1: 350 km
Option 2: 140 km
Option 3: 210 km
Option 4: 300 km
Answer: 1: 350 km
Explanation: Difference in speeds = 14 – 21 = 7 km/h. Time taken in journey
(Till meating) = 70 /10= 7 hrs. Total distance of between both stations
= 10 (14 + 21) = 350 km.
Question 10:
A car travels at a speed of 60 km/h and covers a particular distance in 1 h. How long will it take for another car to cover the same distance at 40 km/h ?
Option 1: 3/2 h
Option 2: 1 h
Option 3: 5/2 h
Option 4: 2 h
Answer: 1: 3/2 h
Explanation:
Question 11:
Two men start together to walk a certain distance, one at 4 km/h and another at 3 km/h. The former arrives half an hour before the latter. Find the distance.
Option 1: 6 km
Option 2: 9 km
Option 3: 8 km
Option 4: 7 km
Answer: 1: 6 km
Explanation: Let the distance = x km According to question,
x/3  x/4 = 1/2 * 4x  3x/12 = 1/2 x 12 = 1/2 x = 6 km
Question 12:
The speed of a bus is 72 km/h. The distance covered by the bus in 5 second is
Option 1: 50 m
Option 2: 74.5 m
Option 3: 100 m
Option 4: 60 m
Answer: 3: 100 m
Question 13:
Mohan covers a distance of 2.5 km by scooter at the rate of 30 km/h. The time taken by Mohan to cover the given distance in minutes is
Option 2: 6
Option 3: 8
Option 4: 5
Answer: 4: 5
Explanation: Given, distance travelled = 2.5km
Speed= 30km/h
Then, time taken = distance/speed= 2.5/30= 1/12
= 60/12= 5 min
Question 14:
Given that the lengths of the paths of a ball thrown with different speeds by two guys are the same, and that the average speed for the first and second throws are respectively 90km/h and 162 km/h, then what is the time taken by the first throw to cover the length if the same for the second thrown is one second ?
Option 1: 3/2 sec
Option 2: 1 sec
Option 3: 2/3 sec
Option 4: 9/5 sec
Answer: 4: 9/5 sec
For same length
S1 × T1 = S2 × T2
90 × 5/18 ×T1 = 162 × 5/18×1
multiplied by 5/18 to convert in m/sec
25 × T1 = 45
T1 = 45/25=9/5 sec
Question 15:
A passenger train takes 1 hr less for a journey of 150 km if its speed is increased by 5 km/hr from its usual speed, what is its usual speed?
Option 1: 40 km/h
Option 2: 25 km/h
Option 3: 30 km/h
Option 4: 36 km/h
Explanation:
⇒ Let the usual speed of the train be x km/hr
⇒ Distance covered in the journey=150km
⇒ Time taken by the train with usual speed =150/x hr
⇒ New speed of train =(x+5)km/hr
⇒ Time taken by the train after increasing the speed =150/ (x+5) hr ⇒(150/x)−150/(x+5) =1
⇒ 150(1/x−1/(x+5))=1
⇒ 150(5)=x(x+5)
⇒ 750=x 2+5x
⇒ x 2+5x−750=0
⇒ x 2+30x−25x−750=0
⇒ x(x+30)−25(x+30)=0
⇒ (x+30)(x−25)=0
⇒ x+30=0 and x−25=0
⇒ x=−30 and x=25 ∴ The usual speed of the train = 25km/hr
Question 16:
Two places P and Q are 162 km apart. A train leaves from P to Q and at the same time another train leaves from Q to P. Both the trains meet after 6 hours. If the train travelling from P to Q travels 8 km/hr faster than the other train, find the speed of both the trains?
Option 1: 9*1/2 and 17*1/2
Option 2: 9*1/2 and 19*1/2
Option 3: 7*1/2 and 17*1/2
Option 4: none of these
Answer: 1: 9*1/2 and 17*½
Explanation:
then , speed of first train = 9*1/2 km/h
and speed of second train = x+8 = 9 *1/2 +8 = 17 1 2 km/h
Question 17:
If a man covers a distance between his house and office on scooter having an average speed of 30 km/hr. he gets late by 10 min. However if he covers with a speed of 40 km/hr. he reaches his office 5 min earlier. What is the distance between his house and office?
Option 1: 36
Option 2: 30
Option 3: 40
Option 4: 42
Answer: 2: 30
Explanation: When speed is 30 km/hr he reaches 10 minutes late when Speed is 40 km/hr he reaches 5 minutes earlier.
Let Distance =D so, D/30−D/40 =15min (4D3D)/120 = 15/60 then,D=30 km.
Question 18:
A boy walks at a speed of 10 km/hr. and reaches his school 15 min late. If he increases his speed by 2 km/hr. he gets late by 5 minutes. Find the distance between his school and house?
Option 1: 15
Option 2: 12
Option 3: 10
Option 4: 16
Answer: 3: 10
Explanation:
let the distance of school from house = x and time = t
speed of boy = 10 km/hr
he is late by = 15 mins = 15/60 hr
=> x/10 = t  15/60 => (x/10) + (15/60) = t.    (1)
then ,speed increased by = 2 km/hr
new speed = 10 + 2 = 12km/hr
he is late by = 5 mins = 5/60 hr
=> x/12 = t  (5/60)
=> (x/12) + (5/60) = t.   (2) equating (1) and (2)
x/12. + 5/60. = x/10 + 15/60 => x/12  x/10.
= (155)/60 => x/60 = 10/60 => x = 10 km
Question 19:
Excluding stoppage the speed of bus is 54 km/ hr including stoppage it is 45km/hr. How many minutes does the bus stops per hour?
Option 2: 15 min
Option 3: 10 min
Option 4: 18 min
Answer: 3: 10 min
= 9 × 60/54 = 10 minutes
Question 20:
The speed of two trains are in the ratio of 7: 9. They are moving in the opposite direction on parallel track. The first train crosses a telegraph pole in 4 seconds whereas the second train crosses the pole in 6 seconds. Find the time taken by trains to cross each other?
Option 1: 36sec
Option 2: 43sec
Option 3: 39sec
Option 4: 41sec
Answer: 4: 41sec
let s1=7x and s2 =9x
now length of first train is a
and length of second train is b.
first train cross pole in 4sec,; 4=a/7x
a=28x
second train cross pole in 6sec; 6=b/9x
b=54x
now required time =(a+b)/s2s1= (54x+28x)/9x7x=82x/2x
=41sec
What is the Relationship Between Speed, Time & Distance ?

Distance/Time = Speed — This shows us how fast or slow an item moves. It is defined as the distance travelled divided by the time it took to travel that distance.

Distance is directly proportional to speed, but time is inversely proportionate. As a result, Distance = Speed X Time, and Time = Distance / Speed, the time taken will reduce as the speed rises, and vice versa.

Any simple problem may be addressed using these formulae. However, while utilising formulae, it's also crucial to remember to use the right units.
Speed, Time, and Distance Tricks
Now, we come across time speed and distance on a daily basis, but we don't really think about the relationship until we put it to the test. If you drive to work at 4 km/hr, you will arrive 20 minutes late; if you drive at 6 km/hr, you will arrive 10 minutes early. Isn't that easy? Competitive tests, on the other hand, manage to perplex us by translating kilogrammes to metres or centimetres, and hours to seconds and milliseconds.