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A train traveling at 72 kmph crosses a platform in 30

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A train traveling at 72 kmph crosses a platform in 30 [#permalink] New post 03 Dec 2005, 00:23
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A train traveling at 72 kmph crosses a platform in 30 seconds and a man standing on the platform in 18 seconds. What is the length of the platform in meters?

240 meters
360 meters
420 meters
600 meters
720 meters
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 [#permalink] New post 03 Dec 2005, 02:39
answer is D 600 meters

76000*30/60 *60 = 600
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 [#permalink] New post 03 Dec 2005, 03:23
This problem is a typical one in that from the fact that the train passes a person in 18 sec, we can know the length of the train coz a person's width is minuscule ( just like a vertical thinnest rod) ...the train pass a person just as passing itself/ its own length.See my illustration for better vision. Correct answer is A
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 [#permalink] New post 03 Dec 2005, 05:26
laxieqv wrote:
This problem is a typical one in that from the fact that the train passes a person in 18 sec, we can know the length of the train coz a person's width is minuscule ( just like a vertical thinnest rod) ...the train pass a person just as passing itself/ its own length.See my illustration for better vision. Correct answer is A


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  [#permalink] 03 Dec 2005, 05:26
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