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 Bridge Cross Baffle (Posted on 2016-10-10)
Six friends Al, Ben, Cal, Dan, Elmer and Frank want to cross a bridge. It is a very dark night but there is only one torch between the six of them. The bridge is narrow so that only two people at a time can cross it. It is known that:

Al takes exactly 1 minute to cross the bridge.
Ben takes exactly 2 minutes to cross the bridge.
Cal takes exactly 4 minutes to cross the bridge.
Dan takes exactly 7 minutes to cross the bridge.
Elmer takes exactly 12 minutes to cross the bridge.
Frank takes exactly 19 minutes to cross the bridge.

When two people cross the bridge, they do so with the pace of the slower person.

Determine the minimum amount of time it will take all six friends to cross the bridge.

 No Solution Yet Submitted by K Sengupta No Rating

 Subject Author Date Wouldda, Coudda, Shouldda done it by computer Charlie 2016-10-10 15:45:39 Comparing methods Brian Smith 2016-10-10 12:38:04 proposed solution Charlie 2016-10-10 12:17:24

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