book Maths Puzzle Numerical Ability

On a canoe trip Rita paddled upstream (against the current) at an average speed of 2 mi/h relative to the riverbank. On the return trip downstream (with the current) her average sp

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Okay I think I wrote the problem correctly this time. I need help converting this to a quadratic equation:

(3+48/N)*(N-2)-48=22

Any help would be appreciated

Thanks again

Bob The reciprocal of two times a certain integer plus the reciprocal of two more times than twice the integer equals 7/24. What is the integer?
Thank You