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Can You Solve This Bridge Crossing Puzzle?

Puzzle04 July 2020 2:37PMIndranil Maiti2 min read417
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Hey puzzle lovers, here is a quick puzzle. Check if you can solve it.

Four persons (A, B, C, D) have to cross a rope bridge in the middle of a darkest night. They have only one flashlight. The rope bridge is not strong enough to carry more than 2 people. All 4 of them take different times to cross the bridge.

  • A takes 1 minute to cross the bridge.
  • B takes 2 minutes to cross the bridge.
  • C takes 5 minutes to cross the bridge.
  • D takes 10 minutes to cross the bridge.
  • The night is so dark, it is impossible to see anything and cross the bridge without the flashlight. And also 2 persons are crossing the bridge together, the faster person has to slow down to accompany the slower person.

    For example, if first, A (1 minute) and C (5 minutes) decided to cross the bridge together then it will take 5 minutes to cross the bridge together as A has to slow down to accompany C with flashlight. Also as it is impossible to cross the bridge without the flashlight, After A and C crossed the bridge, either A or C has to come back to other side of the bridge with the flashlight.

    Can you calculate the minimum time required in total to cross the bridge?

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