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# Two trains are moving in the opposite directions on parallel

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Joined: 26 Dec 2003
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Location: India
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Two trains are moving in the opposite directions on parallel [#permalink]  20 Feb 2004, 18:37
Two trains are moving in the opposite directions on parallel tracks at the speeds of 64 kmph and 96 kmph respectively. The first train passes a tree in 5 seconds whereas the second train passes the tree in 6 secs. Find the time taken by the trains to cross eachother completely?
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Joined: 30 Oct 2003
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Length of train with 64Km/hr = 5 * 64 / 3.6
Length of Train with 96 Kn/hr = 6 * 96/ 3.6

Sum of their length = (5*64+6*96)/3.6

Effective speed = (64+96)/3.6 m/sec

Time = (64*5+6*96)/(64+96) = (320+576)/(160) = 5.6 seconds

I hope I am correct.
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