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When a plane flies at an average speed of 300 km/h , it will use 1200 litres of fuel for every 100 km it travels.
When the same plane flies at an average speed of 200 km/h, it will use 800 litres of fuel for every 80 km it travels.
How much fuel will a plane have to use if it travels a journey of 20 hours at an average speed of 300 km/h for 8 hours and the rest of the journey at an average speed of 200 km/h ?