Question

The winner of the 2016 Keystone (Colorado) Uphill/Downhill mountain bike race finished in a total time of 47 minutes and 25 seconds. The uphill leg was 4.6 miles long, and on this leg his average speed was 8.75 mph. The downhill leg was 6.9 miles. What was his average speed on this leg?

Answer 1

We find the time taken by him during the uphill leg, then we find the time he takes when he travels downhill.

We use speed = distance/time to get the average speed. We also convert the units of time.