Can You Solve This Complex Riddle About Escaping a Cursed Temple?

This one ’s a doozy in that there is a lot going on . The goal is dewy-eyed , you need to bunk a give tunnel with a group of nine people ( including yourself ) . It ’s all the other variable that confuse things .

There are four likely expiration tunnels but only one of them is actually the room out . Each tunnel is a 20 arcminute walk one agency and another 20 arcminute walk of life back . You have an hour to get out . Ideally , you could send dissimilar groups into the tunnels and then meet back at the junction to sleep with which way of life is the exit . But ! Two of the multitude in your grouping may be lying ( or may not be ! you do n’t know if they are or who they are ) , so what combination of people do you send down the people to guarantee your group ’s outlet ?

Ted - Ed explains in the merriment mind puzzler below . reckon the mathematics .