Question

A canoe in still water travels at a rate of 10 miles per hour. The current today is traveling at a rate of 3 miles per hour. If it took an extra hour to travel upstream, how far was the trip one way?

Answer 1

Let n be the length of the trip. Then:
n/(10-3) =n/(10+3) +1
n/7=n/13 +1
13n=7n+91
6n=91
n=91/6 miles
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Answer 2

The trip was 14 miles