Question

A cyclist rides 24 miles at an average speed of 9 miles per hour. At what rate must the cyclist cover the next 20 miles in order to bring the overall average speed up to 12 miles per hour? The cyclist must ride at 00 miles per hour.​

Answer 1

20 m/hr

Explanation:

distance / rate = time

24 miles / 9 miles/hr = 2 2/3 hr

(24 + 20 miles) / 12 miles/hr = 3 2/3 hr

3 2/3 - 2 2/3 = 1 hour to ride the next 20 miles means 20 m/hr