Two trains of equal length travelling in opposite directions at 72 km/h and 108 km/h cross each other in 10 second. In how much time (in seconds) does the first train cross a platform of length 350 m?
Show answer & explanation
Correct answer: D
Explanation
Correct Answer is option 4 i.e. 30
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Understanding |
Application |
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Since, the trains are running in opposite directions: Relative speed = 72 + 108 = 180 km/hr
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Sum of length of both trains = 180 × 5/18 × 10 = 500 m Length of 1st train = 250 m Hence, Time in which 1st train will cross the platform of 350 m length = [250 + 350]/72 × 18/5 = 10800/360 = 30 seconds |