a) 81 minutes
b) 108 minutes
c) 144 minutes
d) 192 minutes
Answer: c
Explanation:
$$\eqalign{
& \frac{1}{x} + \frac{3}{x} = \frac{1}{{36}} \cr
& \frac{4}{x} = \frac{1}{{36}} \cr
& x = 144\,\text{minutes} \cr} $$
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