# 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. Helen says:

A & B cross = 2
A returns = 1
D & V cross = 10
B returns = 2
B & A cross = 2

• Too fast. You are barred from future competition.

2. Mike McCants says:

A & B cross = 2
B returns = 4
D & V cross = 14
A returns = 15
A & B cross = 17

3. Mike McCants says:

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.

4. Pingback: Quiz Question | Skeptical Analysis

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