Number of calories

A 150-lb person who runs at 8 mph for 1 hr burns about 840 calories.  The same person, walking at 2 mph for 90 min, burns about 240 calories.  Suppose a 150-lb person runs at 8 mph for 75 min.  How far would the person have to walk at 2 mph in order to burn the same number of calories as burned when running?The person has to walk __________________miles.(Type an integer or a decimal.)

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