Frances can complete a job in 8 hours, and Joan can complete the same job in 12 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?
Choose the correct choice from the following choices
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 3 units/hr   Joan can complete 2 units/hr   Work done by Frances in 6 hours is 18 units ; work left for Joan is 6 units ( 24 - 18)   Time required by Jones to complete the remaining work will be   6/2= 
<gadget id="calculator">  6/2</gadget>
<output>3</output>
&gt; 3 hours   Given Jones starts at 4PM , so she would complete the work at 7 PM   Answer will be (7 p.m.)
<result>B</result>
Frances can complete a job in 8 hours, and Joan can complete the same job in 12 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?