SOLUTION: a boat travelling upstream goes 120 miles in 6 hours. If the return trip takes 4 hours what is speed in miles per hour of the boat in still water?

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Question 972840: a boat travelling upstream goes 120 miles in 6 hours. If the return trip takes 4 hours what is speed in miles per hour of the boat in still water?
Answer by anand429(138) About Me  (Show Source):
You can put this solution on YOUR website!
Let speed of boat in still water = x
and speed of stream = y
Speed upstream = %28x-y%29+=+%28120%2F6%29mph
Speed downstream = %28x%2By%29+=+%28120%2F4%29 mph
So adding both equations,
2x+=+20+%2B+30
=> x=25mph