The number of hours that Han can mow without refilling the lawnmower is 12.5 hours.
Since the lawnmower has a 5-gallon fuel tank and the lawnmower uses 0.4 gallon of gasoline per hour of mowing, then the number of hours that the lawnmower can use will be:
= 5 / 0.4
= 12.5 hours.
Therefore, the number of hours that Han can mow without refilling the lawnmower is 12.5 hours.
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