2 planes leave the airport at the same time traveling in opposite directions. the first plane traveled at an average rate of 30 mph slower than the 2nd plane. after 3 hours the planes were 3150 miles apart.
enter in an equation that can be used to determine when the planes were 3150 miles apart, let x represent the average rate of the second plane.
enter the average rate of change of the 2nd plane
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