A can do three times the work done by B in one day. They together finish $$\frac

Question

A can do three times the work done by B in one day. They together finish $$\frac{2}{5}$$ of the work in 9 days. The number of days by which B can do the work alone are ?

Options:

A . 120 days

B . 100 days

C . 30 days

D . 90 days

Answer: Option D

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