Two trains are running in opposite directions with the same speed If the length of each train is 120...........

Quantitative Aptitude ( CCS) Problems on trains

Two trains are running in opposite directions with the same speed. If the length of each train is 120 metres and they cross each other in 12 seconds, the speed of each train (in km / hour) is

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Explanation:

Distance covered = 120+120 = 240 m
Time = 12 s
Let the speed of each train = v. Then relative speed = v + v = 2v
2v = distance/time = 240/12 = 20 m/s
Speed of each train = v = 20/2 = 10 m/s
= 10 × 36/10 km/hr = 36 km/hr

Hence, option 3 is the correct answer.