SOLUTION: don williams uses his small boat to go 3 miles up stream. against the current the trip takes 3/5 hours. with the current the trip takes 1/5 hours. how fast is the boat on still wat

Question 384371: don williams uses his small boat to go 3 miles up stream. against the current the trip takes 3/5 hours. with the current the trip takes 1/5 hours. how fast is the boat on still water? what is the speed of the current?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
don williams uses his small boat to go 3 miles up stream. against the current the trip takes 3/5 hours. with the current the trip takes 1/5 hours. how fast is the boat on still water? what is the speed of the current?
...
boat speed x mph
current speed = y
...
upstream speed = x-y
downstream speed x+y
..
distance = 3 miles
..
t=d/r
..
3/(x-y)=3/5
cross multiply
3(x-y)15
/3
x-y =5.........................1
..
3/(x+y)=1/5
x+y =15.........................2
..
add 1 & 2
2x=20
/2
x= 10.
speed of boat in still water = 10 mph.
m.ananth@hotmail.ca
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