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John Shepherd loves solving puzzles at PuzzleFry.com. I am proud PuzzleFry member and like my time invested in solving brain teasers.
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First Assume that A takes 1 min., B takes 2 min, C takes 5 min and D takes 10 min.
First A & B cross the bridge and they took 2 min
A returned and he took 1 min.
C & D cross the bridge and they took 10 min.
B returned and he took 2 min.
A & B cross the bridge they took 2 min.Therefore, The shortest time is 17 min.
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