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Two pipes can fill a tank with tank with...

Two pipes can fill a tank with 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 11a.m. respectively the tank will be emptied at `11 : 40\ adotmdot` b. `12 : 40\ pdotmdot` c. `1: 40\ pdotmdot` d. `2: 40\ pdotmdot`

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