P and Q completed a work together and were paid ₹1,080 and ₹1,440, respectively. If P can do the entire work in 20 days, how many days did they take to complete the work together?

A

$$6\frac{4}{7}$$

B

$$6\frac{3}{7}$$

C

$$8\frac{3}{7}$$

D

$$8\frac{4}{7}$$