Question

If A can complete a piece of work in 6 days and B can do the same work in 12 days then by working together they can complete in how many days. a) 3 days b) 2 days c) 4 days d) 6 days.​

Answer 1

Answer:

ans of the question is optional.............C. ......4 days.....

Answer 2

Efficiency of a person=1/(no. of days he takes to complete a work)

That means efficiency of A=1/6

Efficiency of B=1/12

If they work together then they complete a work with an efficiency

1/6+(1/12)=(3/12)=1/4

That means they complete a work in 4 days

hence option C) 4 days

hope it helps :)