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
Answer: c
Explanation: The outlet pipe empties the one complete cistern in 3 hours
Time taken to empty $$\frac{2}{3}$$ Part of the cistern
$$\eqalign{
& {\text{= }}\frac{2}{3} \times 3 \cr
& = 2\,{\text{hours}} \cr} $$
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