Two trains of lengths 108 metre and 112 metre are running at speeds of 45 km/h and 54 km/h, respectively, towards each other on parallel tracks. In how many seconds will they cross each other?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 8 seconds.
The lengths of both trains = 108 m + 112 m = 220 metres
Since they are moving towards each other, their speeds = 45 km/h + 54 km/h = 99 × (1000 ÷ 3600) = 27.5 m/s
Time = Distance ÷ Speed = 220 ÷ 27.5 = 8 seconds