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# Two trains are moving in the opposite directions on parallel

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Manager
Joined: 26 Dec 2003
Posts: 227
Location: India
Two trains are moving in the opposite directions on parallel [#permalink]

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20 Feb 2004, 19:37
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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?
SVP
Joined: 30 Oct 2003
Posts: 1790
Location: NewJersey USA

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20 Feb 2004, 19:54
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.
20 Feb 2004, 19:54
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