SOLUTION: a motor boat has a four-hour supply of gasoline. How far fom the marina can it travel if the rate going out against the current is 20mi/h and the rate coming back with the current

Question 307831: a motor boat has a four-hour supply of gasoline. How far fom the marina can it travel if the rate going out against the current is 20mi/h and the rate coming back with the current is 30mi/h

Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
a motor boat has a four-hour supply of gasoline. How far fom the marina can it travel if the rate going out against the current is 20mi/h and the rate coming back with the current is 30mi/h
let it go x miles and return x miles
while going the time taken = x/ 20 hours
.
while returning it takes x/30 hours
x/20+x/30 = 4 hours
LCM = 60
3x+2x / 60 = 4
5x= 60*4
5x= 240
x= 48 miles
It can 48 miles from the marina
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