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
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).
Thanks
To calculate the average speed, you need to divide the distance traveled by the time taken. In this case, the distance is 20 kilometers, and the time taken is 26 minutes.
To convert the time from minutes to hours, divide it by 60, since there are 60 minutes in an hour:
26 minutes / 60 = 0.43333 hours (approximately)
Now, divide the distance by the time to find the average speed:
20 km / 0.43333 hours ≈ 46.15 km/h (approximately)
So, the average speed is approximately 46 km/h.
However, none of the given options match the calculated average speed, so the answer is (D) None of these.