Q4 A train leaves Waterloo and travels westbound. Due to track maintenance, it takes the train 2 hours to travel the first 120 km. Once it leaves the construction zone, the train travels at 140 km/h for the rest of the trip. Let s represent the average speed, in km/h, over the entire trip and t represent the time, in hours, spent travelling after leaving the construction zone. If the average speed of the entire trip is 100 km/h, what is the total distance travelled by the train?

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