3500 / 100 = 35 (This is how many times we have to burn 100 calories for the total of 1 pound - 3500 calories)
35 * 15 = 525 minutes or 8.75 hours. This is for 1 pound. We're converting the calories into minutes based on the provided formula of 100 calories = 15 minutes.
525 * 3 = 1575 minutes or 26.25 hours