A 800kg compact car delivers 20% of its output to its wheels. If the car has a mileage of 30 miles/gallon and travels at a speed of 60 miles/hour, how much power is delivered to the wheels? 1 gallon of petrol contains 9 * 10⁸ J

Hi everyone,
The answer to this question is 100 kW, how can we solve?
Thanks!!