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When a lorry travels at an average speed of 40 km/h , it will use 3 litres of fuel for every 80 km it travels.
When the same lorry travels at an average speed of 90 km/h, it will use 8 litres of fuel for every 55 km it travels.
How much fuel will the lorry have to use if it travels a journey of 19 hours at an average speed of 40 km/h for 8 hours and the rest of the journey at an average speed of 90 km/h ?