Sarah needs to schedule her daily commute to work and back. She drives 40 miles to work each morning and 40 miles back home each evening. In the morning, it takes her 1 hour to get to work due to traffic, but in the evening, it only takes her 45 minutes to get home. How much faster, in miles per hour, is her evening commute compared to her morning commute? Let's think step by step and output the final answer within \boxed{}.
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