If a boat goes downstream 72 miles in 3 hours and upstream 60 miles in 6 hours, the rate of the river and the rate of the boat in still water respectively are ________?
Let the speed of boat be x mph and speed of river be y mph.
Time taken to go 72 miles=72/(x+y)=3
Time taken to go 60 miles=60/(x-y)=6
Adding eq (1) and (2)
So y=7 mph
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