Pipes A and B can fill a tank in 4 hours  and 6 hours 40 minutes, respectively; whereas a third pipe C can empty the full tank in 1 hours 40 minutes. A and B are opened at 2:00p.m. and 3:00 p.m., respectively and C is opened at 4:00 p.m. The tank will be completely empty at:

1
7:10 p. m.
2
7:20 p. m.
3
7:00 p. m.
4
7:15 p. m.

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