Question 1195364
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Let's say the boat is heading from West to East.  It is given that the boat will spend 15mins (=1/4hr) crossing.  If the boat is continuously pointed directly East, then the only additional information you need is the 2mi/hr river current.

Distance downstream upon landing at East side of river is:

              2mi/hr * (1/4)hr =  (1/2)mi