Brayden, Wyatt, Chase and Steven have to walk through a long dark tunnel. They only have one torch between them so a maximum of two people can go through the tunnel at any one time. Each person takes a different amount of time to get through the tunnel and if two people walk together they must walk at the rate of the slowest.
Brayden takes 4 minutes, Wyatt takes 7 minutes, Chase takes 11 minutes, Steven takes 14 minutes. What is the least amount of time for all four to walk through the tunnel? 
Notes: 
Example:
If Chase and Steven walk through the tunnel together it will take 14
minutes, If Chase then walks the torch back through the tunnel a total of 25 minutes will have passed. Continue till all four are at the other end of the tunnel.
Topics: Starter  Logic  Problem Solving  Puzzles
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Previous Day  This starter is for 8 February  Next Day
39 minutes:
Brayden and Wyatt walk through taking 7 minutes
Brayden walks back with the torch taking 4 minutes [11 minutes total]
Chase and Steven walk through taking 14 minutes [25 minutes total]
Wyatt walks back with the torch taking 7 minutes [32 minutes total]
Brayden and Wyatt walk through taking 7 minutes [39 minutes total]
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