Using the Swiss rule of thumb (reaction distance in metres = speed in km/h ÷ 10 × 3), how far does a car travelling at 110 km/h move during the driver's reaction time?
Answer and explanation
Correct answer: A. 33 m
- Step 1: Reaction distance = 110 ÷ 10 × 3. Step 2. = 33 m. Answer: 33 m. Why not the others: 11 m results from having left out the factor 3. 121 m results from having used the braking distance formula. 66 m results from having doubled the reaction distance.
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