Question 482696
I would set this up in the following manner with two equations:
rate*time = rate*rime


20x = 40y
x + y = 1.5; 
y = 1.5 - x

Then substitute equation two into equation one.
20x =  40(1.5- x)
20x = 60 - 40x
60x = 60
x = 1
y therefore comes out to .5
Cleomenius.