Q. Two pipes A and B can separately fill a tank in 2 hours and 3 hours respectively. If both the pipes are opened simultaneously in the empty tank, then the tank will be filled in:
Answer: 1 hour 12 minutes
Notes: Part of the tank filled by pipe A and B in 1 hour $latex = \frac{1}{2}+\frac{1}{3}=\frac{3+2}{6} = \frac{5}{6}\ parts&s=1$ ∴ Required Time $latex = \frac{6}{5}\ hours&s=1$ $latex = 1\ hour\ \frac{1}{5}\times 60 = 12\ minutes.&s=1$ Hence option [A] is correct answer.

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