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Even if Amazon expands the range of the drones, the math behind its marketing claims still doesn’t make a lot of sense. If a drone could travel the 60 miles to San Francisco, for instance, it would have to fly at 120 mph to make the promised 30-minute delivery time, not even counting time needed to fill the order in the warehouse. Taking, again, the 120-package UPS truck as the counterexample, the image of 120 drones flying at 120 mph to San Francisco starts to look a little less efficient. And don’t forget they have to bring those little plastic boxes back.