A solid steel shaft transmits 40kW of power at a speed of $$\frac{75}{\pi} Hz$$. The internal torque needed in the shaft is

A

$$\frac{812}{3}$$ Nm

B

$$\frac{800}{3}$$ Nm

C

$$\frac{541}{2}$$ Nm

D

$$\frac{400}{3}$$ Nm