Latest GMAT Aptitude Question SOLUTION: Frances can complete a job in 12 hours, and Joan can complete the same job in 8 hours. Frances starts the job at 9 a.m., and stops working at 3 p.m. If Joan starts working at 4 p.m

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(#M40000249) GMAT question Keep an EYE

Frances can complete a job in 12 hours, and Joan can complete the same job in 8 hours.
Frances starts the job at 9 a.m., and stops working at 3 p.m. If Joan starts working at 4 p.m. to
complete the job, at what time is the job finished?
(A) 6 p.m.
(B) 7 p.m.
(C) 8 p.m.
(D) 10 p.m.
(E) 12 p.m.

Asked In GMAT neeraj (14 years ago)

Solved Tijo Jose Read Solution (2)

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Tijo Jose  (14 years ago)

Answer is (C): 8 p.m. Half of the work is done by Frances, as he works for 6 hours. For, half of the work to be done, Joan takes 4 hours. So, job will be finished by 8 p.m.

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Abhishek  (8 years ago)

8p.m.
F J F J
hr 12 8 6 12/3 = 4
work=LCM(hr)=24
rate 24/12=2 24/8=3 2 3
=====================================================
work = 12 remaining = 12

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