Time and Distance
Time and Distance - Important Points
| 1. | In what time an athlete can cover a distance of 500 m if he runs at a speed of 36 kmph? |
|---|
A. 50 seconds
B. 55 seconds
C. 72 seconds
D. 80 seconds
View Answer Discuss Work SpaceAnswer: option a
Explanation:
Speed given = 36 kmph = 36 x 5 /18 m/sec = 10 m/sec
Distance to be covered = 500 m
Time taken = Distance / speed = 500 / 10 = 50 secs
| 2. | A train travels from City A to City B at a speed of 44 kmph, while on its return journey, it was travelling at speed of 77 kmph. The average speed (in Kmph) of the train is: |
|---|
A. 56
B. 58.5
C. 60
D. 60.5
View Answer Discuss Work SpaceAnswer: option a
Explanation:
Let x be the speed of the train while going from City A to B.
Let y be the speed of the train while going from City B to A.
Average speed of the train is given by = 2xy / (x+y)
Average speed = (2 x 44 x 77) / (44 + 77 )
Average speed = 56
| 3. | A bus travels from City X to City Y at a speed of 32 kmph, while on its return journey, it travels at the speed of 96 kmph. Find the average speed of the bus (in kmph). |
|---|
A. 64
B. 58
C. 48
D. 44
View Answer Discuss Work SpaceAnswer: option c
Explanation:
Let x be the speed of the bus while going from City X to Y. Let y be the speed going from City Y to X.
Average speed of the bus is given by = 2xy / (x+y)
Average speed = (2 x 32 x 96) / (32 + 96 )
Average speed = 48
| 4. | A car completes journey in 10 hrs, the first half at 21 kmph and the second half at 24 kmph. The distance covered (kms) is: |
|---|
A. 224
B. 214
C. 234
D. 204
View Answer Discuss Work SpaceAnswer: option a
Explanation:
Let the distance to be covered be x km
Then x/2 km is travelled at a speed of 21 kmph and x/2 at 24 kmph
Time taken to covered whole journey is 10 hrs
=> x / (2 x 21) + x / (2 x 24) = 10
=> x / 42 + x / 48 = 10
=> 48x + 42x = 42*48*10
=> x = (42*48*10) / 90
=> x = 224
Distance covered = 224 km
| 5. | A person travels from city A to city B. During his onward journey his speed was 12 kmph and while returning his tripled his speed. His average speed (in kmph) is: |
|---|
A. 18
B. 22
C. 24
D. 36
View Answer Discuss Work SpaceAnswer: option a
Explanation:
Speed of backward journey = 36 kmph
Average Speed = 2*12*36 / (12 + 36)
= 18 kmph
Time and Distance Questions and Answers FAQ
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