A cyclist rides his bike at a constant speed of 15 miles per hour. He begins his journey at 8:00 AM and continues until 11:00 AM. Another cyclist starts from the same point at 9:00 AM and rides at a speed of 20 miles per hour. How much farther has the first cyclist ridden compared to the second cyclist by 11:00 AM? Let's think step by step and output the final answer within \boxed{}.
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