A. B and C can independently complete a work in 10, 15 and 20 days respectively. If they start the work together and A leaves after 2 days and B
leaves after 4 days the numberof days required for the completion of work is

A

$$13\frac{1}{3}$$

B

$$12\frac{2}{3}$$

C

$$11\frac{1}{3}$$

D

$$10\frac{2}{3}$$