A woman rows a boat 1.75 miles upstream against a constant current in 35 minutes. She then
rows the same distance downstream (with the same current) in 15 minutes. What is the rate of
the current?

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  1. since distance = speed * time,
    if the current is c and her speed is s,

    35(s-c) = 1.75
    15(s+c) = 1.75

    Now just solve for c.

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