A man travels from A to B at a speed of 50 km/hr and returns to A byincreasing his speed by 30%. Whatis his average speed during the whole journey?

A

$$56\frac{12}{23}$$ km/hr

B

$$57\frac{1}{2}$$ km/hr

C

$$56\frac{2}{3}$$ km/hr

D

$$52\frac{1}{3}$$ km/hr