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1. An outlet pipe can empty a cistern in 3 hours. In what time will empty $\frac{2}{3}$ of the cistern?

A. 3 hours

B. 5 hours

C. 2 hours

D. 4 hours

Solution:

The outlet pipe empties the one complete cistern in 3 hours
Time taken to empty

\frac{2}{3}

Part of the cistern

\begin{aligned} = \frac{2}{3} \times 3 \\ = 2 hours \end{aligned}

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