Frances can complete a job in 10 hours, and Joan can complete the same job in 10 hours. Frances starts the job at 9 a.m., and stops working at 3 p.m. If Joan starts working at 6 p.m. to complete the job, at what time is the job finished?	Options:
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 2.4 units/hr   Joan can complete 2.4 units/hr   Work done by Frances in 6 hours is 14.4 units ; work left for Joan is 9.6 units ( 24 - 14.4)   Time required by Jones to complete the remaining work will be 14.4/2.4 =&gt; 4 hours   Given Jones starts at 6 PM , so she would complete the work at 10 PM   Answer will be (10 p.m.)
<result>D</result>
Frances can complete a job in 10 hours, and Joan can complete the same job in 10 hours. Frances starts the job at 9 a.m., and stops working at 3 p.m. If Joan starts working at 6 p.m. to complete the job, at what time is the job finished?