A can do a work in 12 days and B can do the same work in 20 days if both

A can do a work in 20 days and B can do the same work in 30 days. In how many days, can A and B together do the work? (A) 10 (B) 12 (C) 15 (D) 16

A can do a work in 25 days and B can do the same work in 20 days. They work together for 5 days and then A goes away. In how many days will B finish the work?

A can do a work in x days and B can do the same work in y days. If xgty , then who can do more work in 6 days?

If A can do a work in 10 days and B can do the same work in 15 days, then how many days will they take to complete the work both while working together?

A and B can do a work in 12 days, Band C can do the same work in 15 days, C and A can do the same work in 20 days. The time taken by A, B and C to do the same work is