A man goes from A to B At the speed of 5 kmph and returns from B to A at 4 kmph. His average speed during the whole journey is

A

$$\frac{35}{9}$$ kmph

B

$$\frac{40}{9}$$ kmph

C

$$\frac{46}{9}$$ kmph

D

$$\frac{50}{9}$$ kmph