y/n is going for a walk. he walks for 7.5 miles at a speed of 3 miles per hour. For how many hours does he walk?

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5(-9w) put expression in distributive property

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).