A jet engine consumes 1 kgof fuel for each 40 kg ofair intake. Fuel consumption is 1 kg/sec. When aircraft travels in still air at 200 m/sec, velocity of discharge gases with respect to engine is 700 m/sec. The power developed by engine is

A

7200 kW

B

5600 kW

C

2070 kW

D

4140 kW