SOLUTION: On a weekend outing, Charles 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 874896: On a weekend outing, Charles 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 5 mph, how fast must Charles travel in order to return in 10 hours?
You can put this solution on YOUR website! Boat speed speed x mph
current speed 5 mph
..
against current x- 5
with current x+ 5
..
against current 6 hours
with current 4 hours
Distance is same. D=r*t
6 ( x - 5 ) = 4 ( x + 5 )
6 x - 30 = 4 x + 20
6 x - 4 x = 30 + 20
2 x = 50
/ 2
x = 25 mph
Boat speed speed = 25 mph
