Aptitude & Reasoning
Quantitative Aptitude
Objective
Nov 23, 2012
Two trains 100 meters and 120 meters long are running in the same direction with speeds of 72 km/hr; in how much time will the first train cross the second?
Detailed Explanation
Relative speed of the trains = (72 - 54) km/hr = 18 km/hr
= (18 * 5/18) m/sec = 5 m/sec.
Time taken by the trains to cross each other
=Time taken to cover(100 + 120) m at 5 m/sec = (220/5)sec =44 sec.
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