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Tom took 16 hours to drive the 1,000 highway miles from Chicago to Boston

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Tom took 16 hours to drive the 1,000 highway miles from Chicago to Boston. He drove the first eight hours at constant speed, and then had to lower his speed considerably by 25 miles per hour for the remainder of his journey to Boston on account of construction. However, he maintained this constant lower speed for another 8 hours for the remainder of his journey to Boston. What was his lower speed.