A person driving a car with a speed of 72 km/h suddenly sees a boy crossing the road. If the distance moved by car, before the person apply brakes is 5 m, the reaction time of the person is: A. 0.5s B. 0.1s C. 10 s D. 0.25s

Answer: D. 0.25s


v = 72 km/hr = (72 x 5)/18 = 20 m/s

Time taken to cover 5m distance, t = distance/velocity

t = 5/20 = 0.25 sec

Therefore, the reaction time of the person is 0.25 sec.

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