algebra/ word problem
posted by lulu on .
Justin paddles his kayak 6 miles upstream in 1,5 hours. he turns around and paddles downstream, the same distance, in only 1 hour. What is the rate in still water and what is the rate of the water's current

let x  rate in still water
y  rate of current
R * T = D
UPS xy 1.5 6mi
DOWNS x+y 1 6mi
1.5(xy)=6  1.5x1.5y = 6
1.5[(x+y)=6]  1.5x1.5y = 9
________________
by elimination 3y = 3
method y = 1mph(current)
x+1=6
x=5mph (still water)