A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together can do it in 2 hours. How long will B alone take to do it?

Two pipes A and B also can separately fill a cistern in 60 minutes and 75 minutes respectively. There is a third pipe at the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 50 minutes. In how much time can the third alone empty the cistern?

A can finish a work in 18 days and B can do the same work in 15 days. B worked 10 days and left the job. In how many days, A alone can finish the remaining work?

A cistern can be filled by a pipe in 15 hours. But due to a leak in the bottom the cistern is just full in 20 hours. When the cistern is full, the leak can empty it in:

A and B can do a piece of work in 45 and 40 days respectively. They began to work together but A leaves after sometime and B finished the remaining work in 23 days. After how many days did A leave?

Rahul can do a piece of work in 20 days while Santhosh can do it in 12 days. Santhosh worked at it for 9 days and left. Rahul can finish the remaining work in

A and B can together finish a work in 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?

A tap can empty a tank in one hour . A second tap can empty it in 30 minutes. If both the taps operate simultaneously, how much time is needed to empty the tank?

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is:

Two pipes can fill a cistern in 9 hours and 12 hours respectively. In how much time will they fill the cistern when opened together?