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Question

Harry can run a stretch of 400m in 100 seconds. The time taken by him to run 100m at double the speed will be


A

15 sec

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B

25 sec

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C

20.5 sec

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D

12.5 sec

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Solution

The correct option is D

12.5 sec


Present speed of Harry = DistanceTime=400m100s=4m/s

Double of Harry’s speed = 2 × 4= 8 m/s

New speed = 8m/s

Distance to be travelled = 100m

Speed = DistanceTime

Time = DistanceSpeed=1008 = 12.5 sec


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