look mate, if you want to ask a question, you should put the verb befor the subject. It's the Subject-verb inversion. for example the sentance is "the boat is scheduled to leave" the question should be either the same sentance with a certain intonation or with Subject-verb inversion like this "Is the boat scheduled to leave" so the correct sentance is When is the boat is scheduled for leaving to Mali Island (I would say scheduled to leave to XZY) And about the other one, the second is the correct sentance
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