[" 2.Ravi can do a piece of work in "15" hours while Raman can do it in "12" hours.How long will "],[" both take to do it,working together? "]

Ravi can do a piece of work in 15 hours while Raman can do it in 12 hours. How long will both take to do it, woking together?

A can finish a piece of work in 12 hours while B can finish it in 15 hours. How long will both take to finish it, working together?

A can do a piece of work in 7 days of 9 hours each and B can do it in 6 days of 7 hours each. How long will they take to do it,working a together 8(2)/(5) a day?

Raj can do a piece of work in 20 days and Rohan can do it in 12 days. How long will they take, if both work together?

Amit can do a piece of work in 4 days and Sumit can do it in 6 days How long will they take, if both Amit and Sumit work together ?

Amit can do a piece of work in 4 days and Sumit can do it in 6 days How long will they take, if both Amit and Sumit work together ?

A can do a piece of work in 10 days and B can do the same work in 12 days. How long will they take to finish the work, if both work together?

A can do a piece of work in 8 hours while B aline can do it in 12 hours. Both A and B working together can finish the work in time ?