Question 1127422
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<pre>
The distance from Greentown to Glenavon is  D1 = g*(15+x) miles downstream.


The distance from Glenavon to Cambria is  D2 = g*(15-x)  miles upstream.


The difference D1 - D2 is 2 miles, according to the condition.


It gives you an equation


g*(15+x) - g*(15-x) = 2,


which you can easily solve and find "x", the rate of the current.


x = {{{1/g}}} miles per hour.
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Solved.