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11)

Two pipes A and B can fill a tank in 18 hours and 12 hours respectively. If both the pipes are opened simultaneously, then the time taken to fill the tank is_____

12)

Two pipes can fill a tank in 10h and 16h respectively. A third pipe can empty the tank in 32h. If all the three are opened simultaneously, then in how much time the tank will be full?

**[IBPS Clerk 2013]**

13)

Two pipes can fill a tank in 2h and 3h respectively. If both pipes are opened simultaneously, then how much time the tank will be full?

14)

Pipe A can fill a tank in 10 min and pipe B can empty it in 15 min. If both the pipes are opened in an empty tank, the time tanen to make it full is___

**[SSC CPO 2009]**

15)

Three pipes are fitted to a cistern. The empty cistern is filled by the first and the second taps in 3 and 4 h respectively. The full cistern is empties by the third tap in 5 h. If all the three taps are opened simultaneously, the empty cistern will be filled up in___ time.

**[SSC Multitasking 2013]**

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