A bank robber is planning a heist of a high-tech bank vault. In order to exploit a weakness in the bank’s security system, he needs to set off his dynamite exactly 45 seconds after triggering the banks silent alarm – If he sets it off earlier, a failsafe will kick in and electrocute him. If he sets it off later, the cops will be notified. The bank’s security system will prevent him from bringing in any electronics or clocks, but he knows that it takes 1 minute for a 100 dollar bill to burn completely. He also knows that a 100 dollar bill burns at a non-uniform rate (there’s more ink in the portraits). If he’s able to take 2 100 dollar bills and a box of matches in to the bank with him, how can the robber time his dynamite?
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