A bus covers a total distance of 400 km forits to and fro journey, in 8 hours. If the average speed of the bus in the onward journey is 25% more than that in the return journey, then the speed of the bus in the onward journey (in km/hr) is

A

$$25\frac{3}{4}$$

B

$$50\frac{1}{4}$$

C

$$56\frac{1}{4}$$

D

45