Task: Question Answering
Input (English): Problem: triathlete dan runs along a 4 - mile stretch of river and then swims back along the same route. if dan runs at a rate of 10 miles per hour and swims at a rate of 6 miles per hour, what is his average rate for the entire trip in miles per minute ?
Options: a. 1 / 8, b. 2 / 15, c. 3 / 15, d. 1 / 4, e. 3 / 8
Output (English): a