Quiz Question

One of a continuing series

Here’s one I cribbed from the Internet. It’s out there, so don’t search it out for the answer.

A group of four people has to cross a bridge. It is dark, and they have to light the path with a flashlight. No more than two people can cross the bridge simultaneously, and the group has only one flashlight. It takes different time for the people in the group to cross the bridge:

  • Annie crosses the bridge in 1 minute.
  • Bob crosses the bridge in 2 minutes.
  • Volodia Mitlin crosses the bridge in 5 minutes.
  • Dorothy crosses the bridge in 10 minutes.

How can the group cross the bridge in 17 minutes? Post your answer as a comment below.

5 thoughts on “Quiz Question

  1. Actually, the solutions are symmetric. Helen’s total is also 17. 10 for D & V, 4 for A & B cross twice, and 3 for A returns and B returns. Total 17.

  2. Pingback: Quiz Question | Skeptical Analysis

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