SOLUTION: Andy is boating on a river. He travels 7 miles downriver in half an hour. He then returns 7 miles upriver in 52.5 minutes. If the speed of the river is constant, what is the speed

Question 927438: Andy is boating on a river. He travels 7 miles downriver in half an hour. He then returns 7 miles upriver in 52.5 minutes. If the speed of the river is constant, what is the speed of the boat in still water?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
mph = mi/hr
..........
r + c = 14mph
r - c = 8mph

2r = 22mph
r = 11mph and c = 3mph
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