A surface miner with 2.0 m cutting drum width excavates coal in windrowing mode from a bench with effective face length 200 m. The cutting speed of the surface miner is 10 m/min and the cutting depth 25 cm. The density of coal is 1.4 tonne/m³. If the average turning time of the machine at the face end is 5 min, the rate of production in tonne/hour becomes

A. 320

B. 350

C. 360

D. 380

Answer: Option B