A driver's reaction time is 1.5 s. How far does a car travelling at 72 km/h move before the driver begins to brake?

Answer and explanation

Correct answer: C. 30 m

  1. Step 1: Speed in m/s = 72 / 3.6 = 20 m/s. Step 2. Distance = 20 x 1.5 = 30 m. Answer: 30 m. Why not the others: 54 m: 54 m halves the km/h figure instead of converting to m/s. 20 m: 20 m covers only one second, ignoring the 1.5 s reaction time. 40 m: 40 m adds an extra half second that the question does not give.

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