A can do a piece of work in 7 days and B can do it in 6 days how long will they both work together to complete the work?  Choose the correct choice from the following answers:
A) 6/11 B) 8/13 C) 3/13 D) 9/11 E) 10/13
Explanation:   A’s one day work = 1/5   B’s one day work = 1/6   (A+B)’s one day work = 1/7 + 1/6 = 13/42 =&gt; time = 42/13 = 3 3/13 days   Answer: Option 3/13
<result>C</result>
A can do a piece of work in 7 days and B can do it in 6 days how long will they both work together to complete the work?