A woman covers a certain distance by car at 75 km/h and immediately returns by the same car to the starting point at 100 km/h. What is the average speed of the car?

A

$$95\frac{2}{7}$$km/h

B

$$85\frac{5}{7}$$km/h

C

$$93\frac{3}{7}$$km/h

D

$$86\frac{3}{7}$$km/h