A man is walking at an average speed of 4 miles per hour alongside a railroad track. A freight train, going in the same direction at an average speed of 30 miles per hour, requires 5 seconds to pass the man. How long is the freight train? Give your answer in feet. 

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Length of train 1317 30 mi/h t=0+ 4 mi/h- 5 sec t=5 1317