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# airplanes back and forth fly 400mile, when running free

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Manager
Joined: 27 Jul 2003
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Location: Singapore
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airplanes back and forth fly 400mile, when running free [#permalink]  05 Oct 2003, 23:11
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1. airplanes back and forth fly 400mile, when running free 350km/h,
return trip against the wind 250km/h, asks the average speed

2. 9 candidates 4 individual compositions committees, do not arrange
the priority, how many combinations??
SVP
Joined: 03 Feb 2003
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(1)
v—the free velocity of the plane; v=350
w—the velocity of wind

againts the wind) v-w=250, so w=100
along the wind) v+w=450

Vav=2*250*450/(250+450)=2*250*450/700=321.42

(2) 9C4?
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Joined: 12 Sep 2003
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Re: PS#9 [#permalink]  06 Oct 2003, 20:36
[quote="araspai"]1. airplanes back and forth fly 400mile, when running free 350km/h,
return trip against the wind 250km/h, asks the average speed

1- But what if both speeds already consider the "wind effect"?
Re: PS#9   [#permalink] 06 Oct 2003, 20:36
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