Two trains having lengths of 210 m and 140 m are running at speeds of 80 km/h and 150 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. 0.3
Lengths = 210 m + 140 m = 350 m (total distance to cross)
Speeds = 150 km/h − 80 km/h = 70 km/h = 175/9 m/s (relative speed)
Time = 350/(175/9) = 18 seconds = 18/60 = 0.3 minutes