If i ran 1/2mile,5/8mile,1&3/5mile how manyvmore miles do i need to reach 4miles
http://www.mathsisfun.com/fractions_addition.html
http://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/fractions-unlike-denom-pre-alg/v/adding-fractions-with-unlike-denominators