Two buses start from a house at an interval of 5 minutes and move with a speed of 10 km/h in the same direction. With how much speed (km/hr.) should a woman coming from the opposite direction towards the house travel to meet the buses at an interval of 3 minutes?

A

6.5

B

6

C

$$6\frac{1}{3}$$

D

$$6\frac{2}{3}$$