Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?

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Q:1

12 min

15 min

25 min

50 min

Explanation:

Part filled by A in 1 min =$ \dfrac{1}{20} $.

Part filled by B in 1 min =$ \dfrac{1}{30} $.

Part filled by $\left(A + B\right)$ in 1 min =$ \left(\dfrac{1}{20} +\dfrac{1}{30} \right) $=$ \dfrac{1}{12} $.

$\therefore$ Both pipes can fill the tank in 12 minutes.

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Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:

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