Question

Two trains are moving in opposite directions @ 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is:
A.36
B.45
C. 48
D.49

Answer 1

Relative Speed = 60+90 km/hr = 150 km/hr
Total distance = 1.10+0.9 km = 2 km
Time= Distance/Speed = 2/150 hr = 2/150*60*60 sec = 48 sec

Answer 2

hey mate.
here's the solution