Question

Two trains are approaching one another from opposite directions on parallel tracks. each train is 150 ft long, but one of the trains is moving at 50 ft/sec, while the other is traveling at only 30 ft/sec. how many seconds elapse from the time the trains first begin to overlap to the time they have completely passed one another?

Answer 1

Time elapsed from the time the trains first begin to overlap to the time they have completely passed one another= 1.875 s

Explanation:

Relative velocity of two trains moving in opposite directions is given by

Vr= V1 + V2

V1= velocity of first train=50 ft/s

V2= Velocity of second train=30 ft/s

so Vr= 50+30= 80 ft/s

distance = d= 150 ft

so the time taken= distance/ relative velocity

t=150/80

t=1.875 s