Two trains are moving in opposite directions 80 km/h and 100 km/h. Their lengths are 1100 m and 900 m respectively. The time taken by the slower train to cross the faster train in seconds is:

Question: Two trains are moving in opposite directions 80 km/h and 100 km/h. Their lengths are 1100 m and 900 m respectively. The time taken by the slower train to cross the faster train in seconds is:

Solution:
Relative speed= (80 + 100) km/h
= 180 × (5/18) m/sec
= 50 m/sec

Distance covered= (1100 + 900) m
=2000 m

Required time= (2000 ÷ 50) sec
= 40 sec