Question: Weary Willie went up a certain hill at the rate of one and a half miles per hour and came down at the rate of four and a half miles per hour, so that it took him just six hours to make the double journey. How far was it to the top of the hill?
Answer: It must have been 6 3/4 miles to the top of the hill. He would go up in 4 1/2 hours and descend in 1 1/2 hours.
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