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A train traveling at 72 kmph crosses a platform in 30

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Director
Joined: 03 May 2007
Posts: 823
Schools: University of Chicago, Wharton School
A train traveling at 72 kmph crosses a platform in 30  [#permalink]

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21 Aug 2007, 06:13
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100% (00:36) correct 0% (00:00) wrong based on 13 sessions

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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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Intern
Joined: 04 Dec 2004
Posts: 31
Location: bangalore

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21 Aug 2007, 06:23
1
72 kmph = 20 meters/second

length of the train = 20*18= 360 meters
length of the train + length of the platform = 20*30 = 600 meters

So, length of the platform = 600-360 = 240 meters
SVP
Joined: 29 Mar 2007
Posts: 2465

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21 Aug 2007, 23:09
Fistail wrote:
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

Use good ol D=rt equation

Platform length and train length
R:72kmph--> 1km/50sec
T:30
D: ? 1/50*30=3/5km 3/5*1000=600m

Train length
R: 1/km/50sec
T:18sec
D: ? 1/50*18 =9/25km *1000m/km = 9*40m=360m

600-360= 240m

Ans A.
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Joined: 09 Sep 2013
Posts: 8179
Re: A train traveling at 72 kmph crosses a platform in 30  [#permalink]

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25 Jun 2018, 09:37
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Re: A train traveling at 72 kmph crosses a platform in 30 &nbs [#permalink] 25 Jun 2018, 09:37
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