a) $$\frac{1}{{24}}$$ day
b) $$\frac{7}{{24}}$$ day
c) $$3\frac{3}{7}$$ days
d) 4 days
Answer: c
Explanation:
$$\eqalign{
& (A + B + C)’s\,1\,{\text{day’s work}} \cr
& = {\frac{1}{{24}} + \frac{1}{6} + \frac{1}{{12}}} = \frac{7}{{24}} \cr} $$
So, all the three together will complete the job in
$$ {\frac{{24}}{7}} {\text{ days}} = 3\frac{3}{7}{\text{ days}}$$
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