SOLUTION: on a weekend outing, bernard rents a motorboat for 10 hours to travel down the river and back. The rental operator tells him to go for 4 hours downstream, leaving 6 hours to return
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Question 146133: on a weekend outing, bernard rents a motorboat for 10 hours to travel down the river and back. The rental operator tells him to go for 4 hours downstream, leaving 6 hours to return upstream.
If the river current flows at a speed of 4mph how fast must Bernard teavel in order to return in 10 hours?
How far downstream did Bernard go before he turned back?
Answer by dealkit(1) (Show Source): You can put this solution on YOUR website!
Assume the boat speed is Xmph
the river speed is 4mph
Since the operators asked him to turn back after 4 hours
and return journey will take 6 hours
(remember that the speed is added in one way, and reduced in return)
(x+4) * 4 = (x-4) * 6
4x+16 = 6x-24
2x = 40
x = 20
speed of boat must be 20mph
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