Pipes & Cisterns

Three pipes, P, Q and R, together take four hours to fill a tank. All the three pipes were opened at the same time. Afte...

Pipes M, N and S can fill a tank in 25, 50 and 100 minutes, respectively. Initially, pipes N and S are kept open for 10 ...

Two pipes, A and B, can fill a tank in 10 minutes and 20 minutes, respectively. Pipe C can empty the tank in 30 minutes....

One pipe can fill a tank 6 times faster than another pipe. If both the pipes together can fill the tank in 40 minutes, t...

Three pipes P, Q and R can fill a cistern in 40 minutes, 80 minutes and 120 minutes, respectively. Initially, all the pi...

A tank is filled by three pipes with different uniform flow rates. When the first two pipes operate together, they fill ...

Pipes P and Q can completely fill a water tank in 10 hours and 15 hours, respectively. A pipe R can empty a tank filled ...

Two inlet pipes, P1 and P2, can fill a cistern in 20 hours and 30 hours, respectively. They were opened at the same time...

Two pipes can fill a tank in 12 hours and 18 hours, respectively, while a third pipe can empty it in 8 hours. How long (...

Two pipes P and Q can fill a tank in 36 minutes and 45 minutes, respectively. If both pipes are opened together, what is...

There are two pipes to fill a tank. Together, they can fill the tank in 15 minutes. If one pipe can fill the tank one an...

A pipe can fill an empty tank in 5 minutes and another pipe can empty it in 6 minutes. If both pipes are opened simultan...

Pipe L can fill a pool in 30 hours and pipe M in 45 hours. If both the pipes are opened in an empty pool, how much time ...