Two pipes can fill a tank in 15 and 12 h...

Two pipes can fill a tank in 15 and 12 hours respectively and third pipe can empty the tank in 4 hours. If the pipes are opened at 8, 9 and 11 o'clock respectively. The tank will be emp tied at that o'clock ____.

45 minutes past 1

40 minutes past 1

55 minutes past 1

40 minutes past 2

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