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A plane flying against the wind covers a 900 kilometer route

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Manager
Manager
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Joined: 12 Feb 2006
Posts: 115

Kudos [?]: 80 [0], given: 0

A plane flying against the wind covers a 900 kilometer route [#permalink]

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New post 28 Feb 2007, 03:00
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A plane flying against the wind covers a 900 kilometer route in 2 hours. The same plane flying with the wind covers the same 900 kilometer route in 1.8 hours. If the speed of the wind is constant what is the speed of the wind?

18 KMH
20 KMH
22 KMH
25 KMH
27 KMH

Kudos [?]: 80 [0], given: 0

SVP
SVP
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Joined: 01 May 2006
Posts: 1794

Kudos [?]: 169 [0], given: 0

 [#permalink]

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New post 28 Feb 2007, 03:40
(D) for me :)

Let set those variables:
o V : the speed of the aircraft in KM/H when there is no wind
o v : the speed of the wind.

Then, we have those equations from the 2 trips
o 900/2 = V-v (1)
o 900/1,8 = V+v (2)

Finally,
(2)-(1) <=> 900*(1/1,8 - 1/2) = 2*v
<=> v = 900 / 2 * (10/18 - 9/18) = 900/2 * 1/18 = 100/4 = 25

Kudos [?]: 169 [0], given: 0

VP
VP
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Joined: 09 Jan 2007
Posts: 1045

Kudos [?]: 162 [0], given: 3

Location: New York, NY
Schools: Chicago Booth Class of 2010
Re: Help with a Rate Question [#permalink]

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New post 28 Feb 2007, 03:43
bz9 wrote:
A plane flying against the wind covers a 900 kilometer route in 2 hours. The same plane flying with the wind covers the same 900 kilometer route in 1.8 hours. If the speed of the wind is constant what is the speed of the wind?

18 KMH
20 KMH
22 KMH
25 KMH
27 KMH


Airplane Speed=A
Wind Speed=W

A-W=900/2=450 Km/h
A+W=900/1.8=500Km/h

Solving for W=25Km/h (D)

Kudos [?]: 162 [0], given: 3

Re: Help with a Rate Question   [#permalink] 28 Feb 2007, 03:43
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A plane flying against the wind covers a 900 kilometer route

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