Two trains having lengths of 240 m and 410 m are running at speeds of 80 km/h and 110 km/h, respectively, in the same direction. The time taken (in minutes) by the faster train, coming from behind, to completely cross the other train is
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 1.3
Relative speed = 110 – 80 = 30 km/h
Convert to m/s: 30 × 5/18 = 25/3 m/s
Total distance to be covered = 240 + 410 = 650 m
Time = Distance ÷ Speed = 650 ÷ (25/3) = 650 × 3/25 = 78 seconds
Convert to minutes: 78 ÷ 60 = 1.3 minutes