A crew can row 10 miles in 5/6th of an hour down-stream and 12 miles upstream
in 90 minutes. Find the current's rate and crew's rate in still water.
Let speed of crew= 'a' mph
Speed of current = 'b' mph
Down stream ,the speeds will be added
Upstream,the speeds will be subtracted
a+b = $$\frac{\left(10\right)}{\frac{5}{6}}$$
a-b = $$\frac{\left(12\right)}{\frac{3}{2}}$$
Solving the above two equations , a=10 and b=2
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