Using the Swiss rule of thumb (reaction distance in metres = speed in km/h ÷ 10 × 3), how far does a car travelling at 100 km/h move during the driver's reaction time?
Answer and explanation
Correct answer: B. 30 m
- Step 1: Reaction distance = 100 ÷ 10 × 3. Step 2. = 30 m. Answer: 30 m. Why not the others: 10 m results from having left out the factor 3. 100 m results from having used the braking distance formula. 60 m results from having doubled the reaction distance.
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