SOLUTION: In a given river,the current is 6miles per hour. A certain riverboat can travel 18 miles per hour in still water. How far upstream(against the current) can the boat travel if a rou

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Question 363474: In a given river,the current is 6miles per hour. A certain riverboat can travel 18 miles per hour in still water. How far upstream(against the current) can the boat travel if a round trip is to take 10 hours?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
let the distance be x
upstream speed = 12 mph
..
downstream speed = 24 mph
t=d/r
..
x/12+x/24=10
2x+x /24 =10
3x=240
x=80 miles