SOLUTION: Jane took 30min to drive her boat upstream to water-ski at her favorite spot. Coming back in the day, at the same boat speed, to her 20 min. If the current in that part of the rive
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Question 1045065: Jane took 30min to drive her boat upstream to water-ski at her favorite spot. Coming back in the day, at the same boat speed, to her 20 min. If the current in that part of the river is 7 km per hr, what was her boat speed in still water? Answer by jorel555(1290) (Show Source):
You can put this solution on YOUR website! Let r be Jane's rate in still water. Then:
(1/2)/(r+7)=(1/3)/(r-7)
r+7/3=r-7/2
2r+14=3r-21
r=35 kmh. ☺☺☺☺
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