Running vs. Walking. A 150-lb person who runs at 6 mph for 1 hr burns about 720 calories. The same person, walking at 4 mph for 90 min, burns about 480 calories. (Source: FitSmart, USA Weekend, July 19-21, 2002) Suppose a 150-lb person runs at 6 mph for 75 min. How far must the person walk at 4 mph in order to burn the same number of calories burned running?
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