Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by slower train to cross the faster train in seconds is -

Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by slower train to cross the faster train in seconds is -

A 36

B 45

C 48

D 49

E None

Solution

Correct Answer: Option C

Relative speed

= (60+ 90) km/hr

= 150 x 5/18 m/sec

= 125/3 m/sec. Distance covered

= (1.10 + 0.9) km

= 2 km

= 2000 m.

Required time = 2000 x 3/125 sec

= 48 sec.