I am rowing on a river between two cities that are 11 miles apart. When going downstream, I make the journey in (11)/(27) hour (s). When I return upstream, it takes me 1 hour (s).
Added by George R.
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Let's call the speed of the boat in still water "b" and the speed of the current "c". When rowing downstream, the effective speed of the boat is the sum of the boat's speed in still water and the speed of the current, so it is b + c. When rowing upstream, the Show more…
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