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# A train running at 81 km/hr takes 24 seconds to cross a

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A train running at 81 km/hr takes 24 seconds to cross a [#permalink]

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16 Jan 2004, 12:08
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A train running at 81 km/hr takes 24 seconds to cross a platform completely. It takes 10 seconds to pass a man running in the opposite direction at 9 km/hr. What is the length of the platform?
{1km/hr=5/18m/s}

a.250 metres
b.240
c.290
d.210
e.260
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16 Jan 2004, 12:39
guess something is missing in your question ..
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shubhangi

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16 Jan 2004, 12:43
Nothing is missing from the question. Everything you need to solve is there.
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16 Jan 2004, 12:54
is it A ..250?
will show working later
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shubhangi

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16 Jan 2004, 12:57
No.
Show your reasoning maybe can help.
Cheers
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****GMAT Loco****
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16 Jan 2004, 13:05
what i did is relative speed =(81+9)=90*5/18=25
let the lenght of plt =x
distnce for: x/25=10..so x=250???
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shubhangi

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16 Jan 2004, 13:11
How I solved:

81 km/hr = 22.5 m/s
9 km/hr = 2.5 m/s
RS = 25 m/s
Lt + Lp/22.5 = 24sec
Lt = 25 m/s * 10 = 250 metres
Hence, 250 + Lp/22.5 = 24
Therefore, Lp = 290 metres.

Hope that helps.
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16 Jan 2004, 13:15
yeah, i was combining both insame equation i guess.
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shubhangi

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16 Jan 2004, 13:57
Just curious to know who that girl in the picture is sunnyboy. She is hot
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Paul

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16 Jan 2004, 13:58
the previous one?
or current?
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16 Jan 2004, 14:05
Both, but i find this one hotter, maybe because you see the whole silhouette
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Paul

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16 Jan 2004, 14:07
Is Angelina Jolie banned from Canadian television sets?

She's pretty famous here in Uhmerrikuh.

And Gmatclub is such a boyzone!
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16 Jan 2004, 14:09
This one: Angelina Jolie
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16 Jan 2004, 14:10
hehe, just didn't recognize her in that outfit. Change that picture, it is too distracting. How am I to focus on such a beautiful problem with such a despicable woman in the background?
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Paul

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16 Jan 2004, 14:14
Take a cold shower son. Lay off the Viagra, and keep studying...
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16 Jan 2004, 14:14
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