Question

The world record for cycling a stretch of 20 kilometers is 26 minutes. This corresponds to an average speed of, approximately,
(A) 29 mph
(B) 46 mph
(C) 32 mph
(D) None of these

Answers

Bob Smith
20 km / 26 minutes = average speed of 10/13 km per minute. 1 kilometer is approximately 0.621 miles, so 10 kilometers is 6.21 miles. So then, the average speed is 6.21/13 miles per minute. There are 60 minutes per hour, so then the average speed in miles per hour is 60 * 6.21 / 13 = about 28.66 miles per hour. Thus, the answer is (A).
Anonymous
Thanks

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