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9 hrs after a goods train passed a station, another train travelling at a speed of 72 km/hr following that goods train passed through that station. If afterpassing the station the train overtakes the goods train in 3 hours. What is the speed of the goods train?

9 hrs after a goods train passed a station, another train travelling at a speed of 72 km/hr following that goods train passed through that station. If afterpassing the station the train overtakes the goods train in 3 hours. What is the speed of the goods train? Correct Answer 18 km\/hr

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