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A train crossed a man standing on a platform, 300 metres

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CEO
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A train crossed a man standing on a platform, 300 metres [#permalink] New post 26 Dec 2007, 07:49
A train crossed a man standing on a platform, 300 metres long, in 35 seconds and the platform completely in 55 seconds. What is the length of the train?

525
825
300
495
675
Director
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 [#permalink] New post 26 Dec 2007, 09:57
Here's how I see it:

the train is X meters long. At the speed it is traveling it will run it's entire length of X meters in 35 seconds. It takes 55 seconds for it to go 300+X meters (the 300 meters of the platform plus the length of the train to get the tail end past the platform).

So it goes 300 meters in 20 seconds (55-35) and X meters in the other 35.

35/20=1.75
300*1.75=525
X=525m

the train is 525 meters long

perhaps my understanding of the problem is off, but that's my answer for better or worse :-D
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 [#permalink] New post 26 Dec 2007, 12:29
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speed is constant
x/35 = (300+x)/55

x = 525
  [#permalink] 26 Dec 2007, 12:29
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A train crossed a man standing on a platform, 300 metres

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