SOLUTION: Joann took 20 minutes to drive her boat upstream, coming back at the same boat speed, it took her 15 minutes. If the current in that part of river is 5 km per hr, what was her boat

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 Question 27513: Joann took 20 minutes to drive her boat upstream, coming back at the same boat speed, it took her 15 minutes. If the current in that part of river is 5 km per hr, what was her boat speed? Thank YOU!Answer by Paul(988)   (Show Source): You can put this solution on YOUR website!20 minutes = 1/3hours 15 minutes = 0.25hours. --> multiply the whole eqution by 3 -0.25=-8.75 x=35 Hence, the speed of the boat was 35mph. Paul.