You and a group of people are running away from a zombie attack.
The group consists of you, a girl, a lady with an injured leg, and an old man.
The only way to escape the attack is to cross the bridge and cut the ropes. You have exactly 17 minutes before the zombies catch up with you.

 

 

 

Crossing the bridge takes you one minute, the girl two minutes, the lady five minutes and the old man ten minutes.

The bridge can support the weight of two people.

Another problem for you is the darkness. You cannot cross the bridge safely without a light, and you only have an old, weak lamp with you. It can light the way for a maximum of two people. After crossing, each person can safely wait for the others even in the dark.

You must all cross the entire bridge within 17 minutes, otherwise the bridge would collapse when another zombie stepped on it.

 

 

In what order will you cross the bridge to escape the zombies?

 

 

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