Question

A runner completed a 40 km race in 3 hours. She changed her speed after completing each quarter of the distance such that the proportion of the speeds in the first, second, third and the fourth quarter, is given by 23:45 respectively. In how much time then (approximately) did she complete the last quarter of the race?

A 32 minutes Correct Answer Incorrect Answer
B 31 minutes Correct Answer Incorrect Answer
C 29 minutes Correct Answer Incorrect Answer
D 28 minutes Correct Answer Incorrect Answer

Solution

The correct answer is D

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