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Posted by Moby Dick
on 14/9/2009, 5:27 pm
Twenty people have to go through a passageway. Only 3 people are permitted inside it at one time, and the security pass is needed at both ends - so if there are still people at the start, then each time some people complete the passage, at least one person has to return to the start with the security pass. Inside the passage, a group will travel at the pace of the slowest person, and the time it takes each of the 20 people to go one way through the passage is as follows: 1, 4, 6, 7, 10, 12, 14, 15, 20, 23, 30, 35, 35, 39, 41, 41, 45, 50, 53 and 57.
How long will it take for the whole group to get through?
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