PICU . A and B work for 12 and 18 days respectively I can do it. A starts working and If they work alternately one day, In how many days will the work be finished?

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 and B can do a piece of work in 20 days and 25 days. A start the work and they do this work in alternate days. In how many days will this work be completed ?

A and B can do a work in 30 days and 10 days respectively. If they work on alternate days beginning with A, in how many days will the work be completed?

A and B can do a work in 30 days and 10 days respectively. If they work on alternate days beginning with A, in how many days will the work be completed?

Vinay and Varma can do a work in 30 days and 60 days respectively. If they work on alternate days beginning with Vinay, in how many days will the work be completed?

Vinay and Varma can do a work in 30 days and 60 days respectively. If they work on alternate days beginning with Vinay, in how many days will the work be completed?

A and B can complete a work in 12 days and 18 days, respectively. A begins to do the work and they work alternately one at a time for 1 day each. The whole work will be completed in how many days?