Task: Question Answering
Input (English): Problem: a cyclist bikes x distance at 10 miles per hour and returns over the same path at 9 miles per hour. what is the cyclist ' s average rate for the round trip in miles per hour ?
Options: a. 8.1, b. 8.3, c. 8.6, d. 8.9, e. 9.5
Output (English): e