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16)

A bathtub is filled by Pipe A in 4 min and it is empties by pipe B in 5 min. If both pipes are opened together, then time taken to fill the bath tub is ___

**[RRB (TC/CC) 2006]**

17)

A tap can fill a cistern in 40 min and a second tap can empty the filled cistern in 6o min. By mistake without closing the second tap, the first tap was opened. In how many minutes will the empty cistern be filled?

**[SSC CHSL 2010]**

18)

Three taps A, B, C together can fill an empty cistern in 10 min. Tap A alone can fill in 30 min and tap B alone in 40 min. How long will tap C alone take to fill it?

**[SSC CHSL 2010]**

19)

Two pipes can fill a tank separately in 20 min and 30 min respectively. If both the pipes are opened simultaneously, then the tank will be filled in___?

**[SSC CPO 2003]**

20)

A tap can fill a cistern in 8h and a second tap can empty the filled cistern in 16h. If both the pipes are open, the time taken to fill the tank will be___.

**[SSC CPO 2005]**

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