P, Q and R alone can do a piece of work in 5, 6 and 4 days respectively. All three of them began the work together but Q left 1 days before completion of the work. In how many days was the work completed?

A

$$\frac{70}{37}$$ days

B

$$\frac{100}{27}$$ days

C

$$3$$ days

D

$$\frac{80}{23}$$ days