Using the Swiss rule of thumb (reaction distance in metres = speed in km/h ÷ 10 × 3), how far does a car travelling at 40 km/h move during the driver's reaction time?
Answer and explanation
Correct answer: B. 12 m
- Step 1: Reaction distance = 40 ÷ 10 × 3. Step 2. = 12 m. Answer: 12 m. Why not the others: 4 m results from having left out the factor 3. 16 m results from having used the braking distance formula. 24 m results from having doubled the reaction distance.
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