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# Two mechanics were working on your car. One can complete the

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Intern
Joined: 03 May 2012
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Two mechanics were working on your car. One can complete the [#permalink]

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23 Nov 2012, 05:04
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Difficulty:

5% (low)

Question Stats:

84% (02:37) correct 16% (01:50) wrong based on 112 sessions

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Two mechanics were working on your car. One can complete the given job in six hours, but the new guy takes eight hours. They worked together for the first two hours, but then the first guy left to help another mechanic on a different job. How long will it take the new guy to finish your car?

A. 7/4
B. 4/3
C. 15/4
D. 10/3
E. 17/5
[Reveal] Spoiler: OA

Last edited by Bunuel on 23 Nov 2012, 05:15, edited 1 time in total.
Renamed the topic and moved to PS forum.
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23 Nov 2012, 05:15
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chanchalkalra wrote:
Two mechanics were working on your car. One can complete the given job in six hours, but the new guy takes eight hours. They worked together for the first two hours, but then the first guy left to help another mechanic on a different job. How long will it take the new guy to finish your car?

A. 7/4
B. 4/3
C. 15/4
D. 10/3
E. 17/5

Given that the rate of one mechanic is 1/6 job/hour and the rate of another is 1/8 job/hour.

In 2 hours that they work together they complete 2(1/6+1/8)=7/12 of the job and 5/12 part of the job is left to be done.

The second mechanic to complete 5/12 of the job will need time=job/rate=(5/12)/(1/8)=10/3 hours.

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Intern
Joined: 03 May 2012
Posts: 5
Followers: 1

Kudos [?]: 13 [3] , given: 4

Re: Two mechanics were working on your car. One can complete the [#permalink]

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23 Nov 2012, 17:51
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Apologies bunnel...will remember not to post outside next time onwards
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Joined: 03 Aug 2012
Posts: 896
Concentration: General Management, General Management
GMAT 1: 630 Q47 V29
GMAT 2: 680 Q50 V32
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Re: Two mechanics were working on your car. One can complete the [#permalink]

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28 Sep 2013, 01:56
1
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Rate(1)=1/6
Rate(2)=1/8

Combined = 14/48

Work done in 2 days=7/12

Work left = 5/12

Rate * Time = Work left

1/8 * Time = 5/12

Time=10/3
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Re: Two mechanics were working on your car. One can complete the [#permalink]

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15 Nov 2014, 08:03
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: Two mechanics were working on your car. One can complete the [#permalink]

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02 May 2016, 06:43
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).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Re: Two mechanics were working on your car. One can complete the   [#permalink] 02 May 2016, 06:43
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