Question

A car's internal combustion engine can be modeled as a heat engine operating between a combustion temperature of 1500∘C and an air temperature of 20∘C with 30% of the Carnot efficiency. The heat of combustion of gasoline is 47 kJ/g.
Q) What mass of gasoline is burned to accelerate a 1500 kg car from rest to a speed of 20 m/s?
I got the work net value with kinetic energy formula, 300kJ, and 30% of the carnet efficiency, so I got Q_h which is 1000kJ. When to try to get the mass of gasoline burned using the info, heat of combustion of gasoline 47kHJ/g, which I got 21.28g, but it is wrong. Can anyone explain this for me?
nevermind. I got the answer.

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