A can do a piece of work in 12 days and $B$ alone can do it in 16 days. They worked together on it for 3 days and then A left. How long did B take to finish the remaining work?
A can do a piece of work in 20 days while B can do it in 15 days. With the help of C , they finish the work in 5 days. In what time would C alone do it?
A pipe can fill a tank in 16 hours. Due to a leak in the bottom, it is filled in 24 hours. If the tank is full, how much time will the leak take to empty it?
A and B can together finish a work in 30 days. They worked at it for 20 days and then B left. The remaining work was done by A alone in 20 more days. In how many days can A alone do it?
A can do a piece of work in 80 days. He works at it for 10 days and then $B$ alone finishes the remaining work in 42 days. In how many days could both do it?