SOLUTION: pls. help me solve this problem thank you. prob 1. A boat goes 6 miles downstream in a river in 30 minutes and returns upstream in 45 minutes. Find the speed of the boat in st

Question 351528: pls. help me solve this problem
thank you.
prob 1. A boat goes 6 miles downstream in a river in 30 minutes and returns upstream in 45 minutes. Find the speed of the boat in still water and the speed of the current.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
still water speed = xmph
current speed = y mph
...
Time = distance / speed
upstream time = 6/ (x-y ) =(3/4)
3(x-y ) =6*4
x-y = 8.................1
downstream speed = 6/(x+y) = (1/2)
x+y = 12.................2
add 1 & 2
2x=20
x=10 mph speed of boat.
x-y =8
so y =2 mph speed of current
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