Question: A freight train and a passenger train leave a rail yard at the same time and on parallel tracks. The Passenger train travels 5 mph

"A freight train and a passenger train leave a rail yard at the same time and on parallel tracks. The Passenger train travels 5 mph faster than the freight train. The combined distance traveled after 3 hours is 135 miles. What is the average speed of the freight train?" Please show steps to solve.

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