Hello There, 

I would like to cluster 2 gruops together. 

I describe shortly what situation I want to slove.

1. There are 3 groups that they have different arrival and departure time. 

2. First group will arrive at 9:00 and depart at 13:00, second group wil be at 10:00 and depart at 14:00, and the last group will be at 14:00 and depart at 19:00. they can start a tour at least one hour after sine they arrived.  

3. I want to get the first and second groups togerther for a 1 hour tour. Then, they can start the tour at 11am .  

Actually, I can get a result of the time each group can start a tour,(it is like first group starts at 10, second at 11, etc. It is just added one hour at to their arrival time)  but I cant gather two groups in one time. :(((

How can I solve this problem? I input time constraints that groups can start a tour at least one hour later , they have to have enough transit time, and the tour times doens't impact on groups departure tome... etc. However, again.. I cant not cluster them.. even if they can be.
what I have to add for additional constraint?

Please help me...
Thanks..

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Dohee Shim
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#DecisionOptimization