Two tubes A and B can fill a swimming pool in 12 and 24 hours respectively. If both the pipes are used together, then how long will it take to fill the tank?

6 hours

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8 hours

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4 hours

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9 hours

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Solution

The correct option is B 8 hours
Since both the pipes are working together:

Work done by pipe A and B =
$\frac{1}{12} + \frac{1}{24} = (\frac{24 + 12}{24 \times 12}) = \frac{36}{(24 \times 12)} = \frac{1}{8}$

Therefore, answer is 8 hours.

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Two tubes A and B can fill a swimming pool in 12 and 24 hours respectively. If both the pipes are used together, then how long will it take to fill the tank?

The correct option is B 8 hoursSince both the pipes are working together: Work done by pipe A and B = 112+124=(24+1224×12)=36(24×12)=18 Therefore, answer is 8 hours.

The correct option is B 8 hours
Since both the pipes are working together:

Work done by pipe A and B =
$\frac{1}{12} + \frac{1}{24} = (\frac{24 + 12}{24 \times 12}) = \frac{36}{(24 \times 12)} = \frac{1}{8}$

Therefore, answer is 8 hours.