A can do a piece of work n 7 days of 9 hours each and B alone can do it in 6 days of 7 hours each. How long will they take to do it working together 8 2/5 hours a day?	Choose the correct choice from the following answers:
A) 3	B) 4	C) 5	D) 6	E) 7
A can complete the work in (7*9)= 
<gadget id="calculator">(7*9)</gadget>
<output>63</output>
63 days   B can complete the work in   (6*7)= 
<gadget id="calculator">  (6*7)</gadget>
<output>42</output>
42 days   --&gt; A’s one hour’s work= 1/63 and B’s one hour work = 1/42.   (A+B)’s one hour work = 1/63+1/42 = 5/126   Therefore, Both can finish the work in 126/5 hours.   Number of days of 8 2/5 hours each = (126*5/(5*42))= 
<gadget id="calculator">(126*5/(5*42))</gadget>
<output>3</output>
3 day   3nswer : 3.
<result>A</result>
A can do a piece of work n 7 days of 9 hours each and B alone can do it in 6 days of 7 hours each. How long will they take to do it working together 8 2/5 hours a day?