Question 215820
D=RT
D=60(T-1.5)
D=40T
60(T-1.5)=40T
60T-90=40T
60T-40T=90
20T=90
T=90/20
T=4.5 HOURS FOR THE FREIGHT TRAIN.
4.5-1.5=3 hours for the passenger train.
Proof:
60*3=40*4.5
180=180