Two trains are moving in the same direction at the speed of 25 km/hr and 75 km/hr. Their lengths are 120 metres and 130 metres respectively. What will be the time (in seconds) taken by faster train to cross the slower train?
Show answer & explanation
Correct answer: B
Explanation
Relative speed = 75 – 25 = 50 km/hr
= 50 × 5/18 = 125/9 m/sec
Total distance = 120 + 130 = 250 m
Time = 250 ÷ 125/9 = 18 seconds