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Pipe A can fill a tank in 3 hours, pipe ...

Pipe A can fill a tank in 3 hours, pipe B can fill in 4 hours. and Pipe C can empty in 1 hour. All Three pipes are opened in order, at 3, 4 and 5 pm respectively. The tank will be emptied at?

A

7 : 12 p.m.

B

7:15 p.m.

C

7: 10 p.m.

D

7: 18 p.m.

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CHAMPION PUBLICATION-2011 TIER-II PAPER(23)-EXERCISE
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