a) $$\frac{1}{6}$$
b) $$\frac{2}{5}$$
c) $$\frac{1}{9}$$
d) $$\frac{2}{7}$$
Answer: a
Explanation:
A’s 1 day work = $$\frac{1}{{18}}$$
B’s 1 day work = $$\frac{1}{9}$$ [because B take half time than A]
(A + B)’s one day work
$$\eqalign{
& = {\frac{1}{{18}} + \frac{1}{9}} \cr
& = {\frac{{1 + 2}}{{18}}} \cr
& = \frac{1}{6} \cr} $$
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