RRB NTPC 2017 · Question 86 of 1076

'K' can do $$3/4^{th}$$ of a work in 6 days and J can do $$2/5^{th}$$ of the same work in 4 days. How long (in days) will they take, if they work together to finish the work?

1. A$$4\frac{2}{3}$$
2. B$$4\frac{3}{8}$$
3. C$$4\frac{1}{4}$$
4. D$$4\frac{4}{9}$$Correct