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At a steam power plant, steam engines work in pairs, the heat output of the first...

At a steam power plant, steam engines work in pairs, the heat output of the first one being the approximate heat input of the second. The operating temperatures of the first are 710 ∘C and 440 ∘C, and of the second 415 ∘C and 250 ∘C.

If the heat of combustion of coal is 2.8×107J/kg, at what rate must coal be burned if the plant is to put out 960 MW of power? Assume the efficiency of the engines is 65% of the ideal (Carnot) efficiency.

Express your answer using two significant figures.

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