



 
Dom, In my diagram D is the dock where the boat started, S is the position of the slop boat after 2 hours and F is the position of the fast boat after 2 hours. The slow boat travelled at 10 mph for 2 hours. How far did it travel? The angle SDF has a measure of 150^{o} and you want to know the distance from F to S. This looks like a job for the Law of Cosines. Penny  


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