The ratio between the length and the breadth of a rectangular park is 2:1. If a man cycling along the boundary of the park at a speed of 18 kmph, completes one round in 10 minutes, then the area of the park in m?is

A

$$100,000 m^{2}$$

B

$$400,000 m^{2}$$

C

$$500,000 m^{2}$$

D

$$600,000 m^{2}$$