31. The amount of heat produced, on complete burning of 10 kg of a fuel 'A' in pure oxygen is H, Kilo joule. The amount of heat produced on complete burning of 15 kg of a fuel B in pure oxygen is Ha Kilo-Joule. (i) Calculate calorific values of fuels 'A' and 'B'. (ii) Which of the two fuels is better? Justify your answer.
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