Rama and Hari can together finish a piece of work in 15 day. Rama works twice as fast as Hari, then Hari alone can finish work in :
Let Hari take x days to do a job
Then Ram takes $$\frac{x}{2}$$ days
Per day they work together $$\frac{1}{x}+\frac{2}{x} =\frac{3}{x} $$
In 15 days they do $$\frac{x}{(3\times 15)} $$ of work
$$\frac{x}{45}$$=1
x=45
Hari takes 45 days
Option A is correct.
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