1. ok, my dad and I are trying to solve this problem, but we're both having difficulty: "When the moving sidewalk at the airport is broken, as it often seems to be, it takes you 50 s to walk from your gate to baggage claim. When it is working and you stand on the moving sidewalk the entire way, it takes 75 s to travel the same distance. How long will it take you to travel from the gate to baggage claim? 3. I think it has something to do with ratios, but he said something about derivatives. Please help!