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Question

the speed of the current in a river is 2 miles per hour. a boat travels 8 miles downstream (with the current) in this river in the same time that it travels 4 miles upstream (against the current). find the speed of the boat in still water.

Answer 1

current = 2 ,mph

what is boat speed in still water?

it travels 8 miles with the current in same time it travels 4 miles against the current

d = rt, t =d/r = 8/(b+2) = 4/(b-2)

8b -16 = 4b +8

4b = 24

b = 6 mph = boat speed in still water