Discussion
A tap can fill a cistern in 8 hours and another can empty it in 16 hours. If both are opened together, the time (in hours) to fill the tank is:
Answer: C
Work in rates: someone who finishes a job in \( n \) days does \( \tfrac{1}{n} \) of it a day, and rates add.
\[ \frac{1}{8} - \frac{1}{16} = \frac{2 - 1}{16} = \frac{1}{16} \]
\[ t = 16 \text{ hours} \]
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