Read this puzzle and answer the question below.
In this puzzle, 4 men must cross a bridge which can only hold 2 people at a time.
It is nighttime and there is only one flashlight.
Each time 2 men cross the bridge, one man must return with the flashlight for the next crossing.
Every man walks at a different speed.
There is a man who can cross the bridge in 1 hour.
There is a man who can cross the bridge in 2 hours.
There is a man who can cross the bridge in 4 hours.
There is a man who can cross the bridge in 5 hours.
The men MUST all cross the bridge in 12 hours.
Choose the 2 men who cross together first, and then choose each subsequent man or men to cross the bridge. Remember! 2 men must cross the bridge together and 1 man must always return with the flashlight.
- subsequent
- 1
- 2
- 3
- 4
