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An express train service travels from London to Paris are an average speed of 200km/h and returns to London at an average speed of 160km/h.

An express train service travels from London to Paris are an average speed of 200km/h and returns to London at an average speed of 160km/h. Each day the train travels 4 trips from London to Paris and back, taking a total of 18 hours. Find the distance between London and Paris.

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