Question

David and Terri drove a small motorboat down a river with the current. The rate the boat traveled in still water was "r" miles per hour, and the current's average speed was "c" miles per hour. It took them 1.5 hours to travel 4 miles downsteam. Which of the following equations can be used to represent this information?

A. 1.5 = (r + c)4
B. 1.5 = (r - c)4
C. 4 = (r + c)1.5
D. 4 = (r - c)1.5