Two trains is moving in opposite directions at 70 kmph and at 80 kmph Their lengths are 1 3 km and 0...........

Quant (SSC) Problems on trains

Two trains is moving in opposite directions at 70 kmph and at 80 kmph. Their lengths are 1.3 km and 0.7 km respectively. The time taken by the slower train to cross the faster train in seconds is:

24 sec

48 sec

76 sec

102 sec

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Explanation:

Relative speed = (70 + 80) = 150 km/hr.
⇒ (150 x 5/18) m/sec.
⇒ (125/3) m/sec.
Distance covered = (1.30 + 0.7)km = 2 km = 2000 m
Reqd. time = (3/125 x 2000)sec = 48 sec.
Hence, option 2 is the correct answer.