Steel balls at 140°C with a specific heat of 0.50 kJ/kg•°C are quenched in an oil bath to an average temperature of 85°C at a rate of 35 balls per minute. If the average mass of steel balls is 1.2 kg, the rate of heat transfer from the balls to the oil is
(a) 33 kJ/s
(b) 1980 kJ/s
(c) 49 kJ/s
(d) 30 kJ/s
(e) 19 kJ/s
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