The side of the suitcase is a rectangle. One length is 24 inches. The diagonal of the rectangle is 30 inches long. The diagonal is a hypotenuse of a right triangle. The length is a leg. We need to find the other leg.
I would use the starting position, sea level as zero. Then I would convert all those minutes to hours so the answer is an integer and not a decimal. 60 min * (-10 ft / 212 min) = -2.83 ft/hr
