a) 16 hours
b) 18 hours
c) 24 hours
d) None of these
Answer: c
Explanation: Net part filled in 1 hour
$$\eqalign{
& {\text{ = }}\left( {\frac{1}{8} – \frac{1}{{12}}} \right) = \frac{1}{{24}} \cr} $$
The tank will be filled in 24 hours
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