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OpenStudy (anonymous):
Tom, Ed, and Harry started out on a 100-mile journey. Tom and Harry went by automobile at a speed of 25 mph, while Ed jogged along at 5 mph. After a certain distance, Harry got out of the car and continued on jogging at 5 mph while Tom turned the automobile around and went back for Ed. Tom and Ed arrived by automobile at the journey's destination at exactly the same time that Harry arrived. How many hours were required to complete the 100 mile trip?
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