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Robert traveled a distance of 30 km, covering the first 10

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Director
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S
Joined: 17 Dec 2012
Posts: 632
Location: India
Robert traveled a distance of 30 km, covering the first 10  [#permalink]

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New post 03 Jan 2013, 03:03
1
6
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

73% (02:25) correct 27% (02:35) wrong based on 204 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

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Joined: 15 May 2012
Posts: 23
Re: Robert traveled a distance  [#permalink]

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New post 03 Jan 2013, 03:19
2
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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New post 28 Oct 2017, 03:23
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 &nbs [#permalink] 28 Oct 2017, 03:23
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Robert traveled a distance of 30 km, covering the first 10

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