# Bridge Crossing Puzzle

Four people need to move from one side of a bridge to the other at night.

Each can cross at different speeds: 1, 2, 5, and 10 min.

There is only one flashlight and it must be carried each time someone crosses the bridge.

The bridge will only support two people at a time.

Two crossing together move at the slower speed of the two.

You cannot throw it across to your friends on the other side.

**What is the shortest time required to get all 4 to the other side?**

**Solution:**

Obvious answer: Have fastest escort others takes 19 min.

17 min solution: 1 escorts 2 and returns, 5 escorts 10 and 2 returns, and 1 escorts 2 to complete.