Two pipes can fill a tank with water in 15 and 12 hours respectively and a third pipe can empty it in 4 hours. If the pipes be opened in order at 8, 9 and 11 a. m. respectively, the tank will be emptied at

Two pipes can fill a tank with water in 15 and 12 hours respectively and a third pipe can empty it in 4 hours. If the pipes be opened in order at 8, 9 and 11 a. m. respectively, the tank will be emptied at
1). 11:40 a.m.
2). 12:40 p.m
3). 1:40 p.m.
4). 2:40 p.m.

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