Frances can complete a job in 12 hours, and Joan can complete the same job in 9 hours. Frances starts the job at 9 a.m., and stops working at 5 p.m. If Joan starts working at 5 p.m. to complete the job, at what time is the job finished?	Select
A) 6 p.m. B) 7 p.m. C) 8 p.m. D) 10 p.m. E) 12 p.m.
Let the total work be 24 units.   Frances can complete 2 units/hr   Joan can complete 2.67 units/hr   Work done by Frances in 8 hours is 16 units ; work left for Joan is 8 units ( 24 - 16)   Time required by Jones to complete the remaining work will be 8/2.67 =&gt; 3 hours   Given Jones starts at 5PM , so she would complete the work at 8 PM   Answer will be (8 p.m.)
<result>C</result>
Frances can complete a job in 12 hours, and Joan can complete the same job in 9 hours. Frances starts the job at 9 a.m., and stops working at 5 p.m. If Joan starts working at 5 p.m. to complete the job, at what time is the job finished?