Cole, Brayden, Wyatt and Chase 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.
Cole takes 2 minutes, Brayden takes 5 minutes, Wyatt takes 9 minutes, Chase takes 12 minutes. What is the least amount of time for all four to walk through the tunnel? 
Notes: 
Example:
If Wyatt and Chase walk through the tunnel together it will take 12
minutes, If Wyatt then walks the torch back through the tunnel a total of 21 minutes will have passed. Continue till all four are at the other end of the tunnel.
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Previous Day  This starter is for 8 February  Next Day
29 minutes:
Cole and Brayden walk through taking 5 minutes
Cole walks back with the torch taking 2 minutes [7 minutes total]
Wyatt and Chase walk through taking 12 minutes [19 minutes total]
Brayden walks back with the torch taking 5 minutes [24 minutes total]
Cole and Brayden walk through taking 5 minutes [29 minutes total]
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