Two trains having lengths of 450 m and 350 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. 1.6.
Distance to cross = 450 + 350 = 800 m = 4/5 km
Relative speed = 110 − 80 = 30 km/hr
Time (hours) = distance ÷ speed = (4/5) ÷ 30 = 4/150 = 2/75 hours
Time (minutes) = 2/75 × 60 = 120/75 = 8/5 minutes =1.6 minutes