Engineering Board Exam Reviewer · Motion Problems · medium
Marlon requires 3 hours to row 15 miles downstream. The return trip upstream takes 5 hours. Find the average speed of the rowboat in still water.
- 1 mph
- 2 mph
- 4 mph
- 6 mph
Answer
C. 4 mph
Solution
R+C=15/3=5 (downstream) and R-C=15/5=3 (upstream). Solving simultaneously gives R=4 mph.
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