Application Problems

In order to become the Triple Crown Champion, a thoroughbred horse must win three races: the Kentucky Derby (\(1\frac14\) miles long), the Preakness Stakes (\(1\frac{3}{16}\) miles long), and the Belmont Stakes (\(1\frac12\) miles long).  What is the combined length of the three races of the Triple Crown?

How much butter is left in a 10-pound tub if \(2\frac23\) pounds are used for a wedding cake?