Question 163705
D=RT
Seing as the distances are the same:
rt=rt
40(t+1/60)=45(t-1/60)
40t+40/60=45t-45/60
40t-45t=-45/60-40/60
-5t=-85/60
-5t=-17/12
t=(-17/12)/-5
t=(-17/12*-1/5)
t=17/60 travel time is 17 minutes.
Proof:
40(17+1)=40*18=720
45(17-1)=45*16=720