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Two trains leave from the same station, one going north at 30 miles/hr and one...

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Calculus

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Two trains leave from the same station, one going north at 30 miles/hr and one going west at 40 miles/hr. The one going west leaves 1 hour later than the one going north. When the northbound train is 120 miles from the station, how fast is the distance between the trains changing?

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