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Pipes A and B can fill a tank in 5 hours and 6 hours respectively. Another Pipe can empty the full tank in 30 hours. If all three pipes are opened together, then the tank will be filled in :

Solution

✅ Correct Option: 2

Combined rate =15+16−130=6+5−130=1030=13= \frac{1}{5} + \frac{1}{6} - \frac{1}{30} = \frac{6 + 5 - 1}{30} = \frac{10}{30} = \frac{1}{3} tank/hour. Time =3= 3 hours =180= 180 minutes.

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