Dark bridge

Level pending

Aaron, Betsy, Charlie and David are crossing a dark bridge. It is night so they need a flashlight to get across. They only have 1 flashlight and they can't throw it across. They all walk at different speeds. Only 2 people can cross at a time and they have to walk at the speed of the slowest one. What is the shortest amount of time they can take so all of them will get across? The speeds are

Aaron can cross in 1 minute

Betsy can cross in 2 minutes

Charlie can cross in 5 minutes

David can cross in 10 minutes


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