Question

A can do a piece of work in 10 days and B can do it in 30 days.  How long will they take if both work together ​

Answer 1

Explanation:

work done by A in one day =1/10

work done by B in 1 day =1/30

work done by both together =1/10+1/30=2/15

which means 8 days approximately

Answer 2

Answer:

They will take $15\frac{1}{3}$ days if they do it together.