A train traveling at 72 kmph crosses a platform in 30 : PS Archive
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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]

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02 Dec 2005, 23:23
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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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03 Dec 2005, 01:39
answer is D 600 meters

76000*30/60 *60 = 600
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03 Dec 2005, 02:23
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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03 Dec 2005, 04:26
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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03 Dec 2005, 04:26
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# A train traveling at 72 kmph crosses a platform in 30

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