Han is about to mow some lawns in his neighborhood. His lawn mower has a 5-gallon fuel tank, but Han is not sure how much gasoline is in the tank. He knows, however, that the lawn mower uses 0.4 gallon of gasoline per hour of mowing. What are all the possible values for x, the number of hours Han can mow without refilling the lawn mower? Write one or more inequalities to represent your response. Be prepared to explain or show your reasoning.