A can do a piece of work in 5 days and B can do it in 7 days how long will they both work together to complete the work? Options
A) 6/11 B) 8/11 C) 7/12 D) 9/12 E) 10/11
Explanation:   A’s one day work = 1/5   B’s one day work = 1/7   (A+B)’s one day work = 1/5 + 1/7 = 12/35 =&gt; time = 35/12 = 2 9/12 days   Answer: Option 9/12
<result>D</result>
A can do a piece of work in 5 days and B can do it in 7 days how long will they both work together to complete the work?