X and Y can do a piece of work in 20 days and 30 days respectively. The time they take to complete the work by working together is ……………

If A,B and C can respectively complete a piece of work in 20,24 and 36 days respectively .how many days will they take to complete the work, if they work together?

Gauthan and Karthik can do a piece of work in 10 days and 20 days respectively. With the help of Nilesh, they can complete the whole work in 5 days. In how many days can Nilesh alone complete the work ?

Gauthan and Karthik can do a piece of work in 10 days and 20 days respectively. With the help of Nilesh, they can complete the whole work in 5 days. In how many days can Nilesh alone complete the work ?

A, B and C can do a piece of work in10 days, 12 days and 15 days respectively. How long will they take to finish it if they work together?

A and B can do a piece of work in 20 days and 30 days respectively. A start the work and they do this work in alternate days. In how many days will this work be completed ?

A, B and C can complete a piece of work in 10 days, 20 days and 25 days, respectively. If they tak 40 days to complete a piece of work, then in how many days can C alone complete the work ?

X, Y and Z can complete a piece of work in 8, 20 and 25 days respectively. Working together, they will complete the same work in: