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Updated on: 23 Nov 2012, 05:15
Originally posted by chanchalkalra on 23 Nov 2012, 05:04.
Last edited by Bunuel on 23 Nov 2012, 05:15, edited 1 time in total.
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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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
84% (01:59) correct
16%
(02:27)
wrong
based on 183
sessions
History
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Time
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Not Attempted Yet
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
A. 7/4
B. 4/3
C. 15/4
D. 10/3
E. 17/5
23 Nov 2012, 05:15
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chanchalkalra
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.
Answer: D.
P.S. Please read carefully and follow: rules-for-posting-please-read-this-before-posting-133935.html Pay attention to the rules #2 and 3.
23 Nov 2012, 17:51
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Apologies bunnel...will remember not to post outside next time onwards
