Question 360063
let upstream speed be x
downstream speed = x+5
..
upstream time = 1.2 hours
downstream time = 0.9 hours
..
1.2x=0.9(x+5)
1.2x=0.9x+4.5
0.3x=4.5
x=4.5/0.3
x=15 mph upstream speed
20 mph downstream speed
...
m.ananth@hotmail.ca