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doinmybest
We have a ratio of 3 hours / 7.5 miles
We want to know how many miles he can walk in 1 hour so, divide both sides by 3 -> 1 hour / 2.5 miles
He is walking at 2.5 mph
musiclover10045

divide total distance by time

7.5 miles / 3 hours = 2.5 miles per hour is his speed