Due north, Seokjin is walking towards the most famous spot in a park at a rate of 1.3 meters per second. Due east, Yoongi is leaving the same spot at a rate of 1 meter per second. If they started walking at the same time, and Seokjin is initially 79 meters away from the spot, how fast is the distance between them changing after 30 seconds?  Please show complete

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