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

15 sec

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25 sec

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20.5 sec

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12.5 sec

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Solution

The correct option is D
12.5 sec

Present speed of Harry = $\frac{D i s t a n c e}{T i m e}$ $= \frac{400 m}{100 s} = 4 m / s$

Double of Harry’s speed = 2 $\times$ 4= 8 m/s

New speed = 8m/s

Distance to be travelled = 100m

Speed = $\frac{D i s t a n c e}{T i m e}$

Time = $\frac{D i s t a n c e}{S p e e d} = \frac{100}{8}$ = 12.5 sec

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

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