Question 93296
d/50+d/40=(2d/45)+.5
(40d+50d)/2000=(2d+22.5)/45
90d/2000=(2d+22.5)/45 now cross multiply.
45*90d=4000d+45000
4050d-4000d=45000
50d=45000
d=45000/50
d=900 miles for the trip fron x to y.
proof
900/50+900/40=1800/45+.5
18+22.5=40+.5
40.5=40.5