Robert traveled a distance of 30 km, covering the first 10 : GMAT Problem Solving (PS)
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# Robert traveled a distance of 30 km, covering the first 10

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Senior Manager
Joined: 17 Dec 2012
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Location: India
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Robert traveled a distance of 30 km, covering the first 10 [#permalink]

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03 Jan 2013, 03:03
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35% (medium)

Question Stats:

74% (03:02) correct 26% (02:10) wrong based on 146 sessions

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Robert traveled a distance of 30 km, covering the first 10 km in x minutes, the next 10 km in y minutes and the last 10 km in z minutes. If he totally took 3y minutes to cover the whole distance, then which of the following cannot be true? Assume x , y and z are different.

A. z=3x
B. x=3z
C. y=2x
D. x=2y
E. y=3x
[Reveal] Spoiler: OA

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Srinivasan Vaidyaraman
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http://www.sravnatestprep.com

Classroom and Online Coaching

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Joined: 15 May 2012
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Kudos [?]: 2 [1] , given: 1

Re: Robert traveled a distance [#permalink]

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03 Jan 2013, 03:19
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Robert Travelled for x,y and for z min.

Total Time : x + y + z

Which is equal to : 3y

Equating both sides we get

x+y+z = 3y

=> x+z =2y ........ Eqn 1

Looking out at options

D Says x =2y
Using it in Eqn 1

2y + z = 2y

=> Z = 0 mins, Which I guess is not possible.

The Ans is D
I hope I am correct with the explanation.
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Re: Robert traveled a distance of 30 km, covering the first 10 [#permalink]

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23 Aug 2014, 19:40
Hello from the GMAT Club BumpBot!

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Re: Robert traveled a distance of 30 km, covering the first 10 [#permalink]

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18 Dec 2015, 10:13
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Robert traveled a distance of 30 km, covering the first 10   [#permalink] 18 Dec 2015, 10:13
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# Robert traveled a distance of 30 km, covering the first 10

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