Two trains, one of length 400 m and other of 200 m, travel at 36 kmph and 72 kmph respectively. These trains are running on parallel tracks. How long will it take them to cross each other (in sec) if the trains are running in same direction?
Explanation:
36 kmph = 10 m/s and 72 kmph = 20 m/s
T = D/S = (400 + 200)/(20 - 10) = 600/10 = 60 secs.
Hence, 60.
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