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When a car travels at an average speed of 100 km/h , it will use 4 litres of fuel for every 50 km it travels.
When the same car travels at an average speed of 150 km/h, it will use 8 litres of fuel for every 75 km it travels.
How much fuel will a car have to use if it travels a journey of 14 hours at an average speed of 100 km/h for 2 hours and the rest of the journey at an average speed of 150 km/h ?