Algebra
posted by Anna .
A boat's crew rowed 7.5 downstream,with
the current, in 1.5 hours. The return trip upstream against the current,covered the same distance,but took 2.5 hours. Find the crew's rate in still water and the rate of the current.

Rate of still water = 7.5/1.5
Rate of the current water = 7.5/2.5