A driver's reaction time is 1.6 s. How far does a car travelling at 90 km/h move before the driver begins to brake?

Answer and explanation

Correct answer: C. 40 m

  1. Step 1: Speed in m/s = 90 / 3.6 = 25 m/s. Step 2. Distance = 25 x 1.6 = 40 m. Answer: 40 m. Why not the others: 72 m: 72 m halves the km/h figure instead of converting to m/s. 25 m: 25 m covers only one second, ignoring the 1.6 s reaction time. 52.5 m: 52.5 m adds an extra half second that the question does not give.

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