A can do a piece of work in 8 days and B alone can do it in 12 days. How much time will both take to finish the work ?  Choose one.
A) A)4.8 B) B)6.333 C) C)7.333 D) D)8.5 E) E)9
This question can be solved by different methods. We need to conserve time in exams so solving this problem using equations is the good idea.   Time taken to finish the job = XY / (X + Y)   = 8 x 12 / (8 + 12)   = 96 / 20= 
<gadget id="calculator">96 / 20</gadget>
<output>24/5 = around 4.8</output>
4.8 days   4.8nswer: 4.8
<result>A</result>
A can do a piece of work in 8 days and B alone can do it in 12 days. How much time will both take to finish the work ?