A flat plate of length 1 m and width 50 cm is placed in an air stream at $$30^\circ C$$ blowing parallel to it. The convective heat transfer co-efficient is 30 W/(m$$^2$$K). The heat transfer if the plate is maintained at a temperature of $$400^\circ C$$ is

A

5.55 kW

B

4.05 kW

C

55.5 kW

D

6 kW