A 30 km section of road can be driven at 80 km/h or, by speeding, at 100 km/h. How many minutes does speeding save?
Answer and explanation
Correct answer: A. 4.5 minutes
- Step 1: At 80 km/h the trip takes 30/80 x 60 = 22.5 minutes; at 100 km/h it takes 30/100 x 60 = 18 minutes. Step 2. The saving is 22.5 - 18 = 4.5 minutes. Answer: 4.5 minutes. Why not the others: 22.5 minutes: 22.5 minutes is just the slower journey time. 90 minutes: 90 divides by the speed difference, which is not a time. 9 minutes: 9 minutes doubles the real saving.
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More The cost of speeding questions
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