Center of Mass: Dog and Boat physics question?

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Caroline

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A 3.5 kg dog stands on an 15 kg flatboat and is 6.1 m from the shore. He walks 2.6 m on the boat toward shore and then stops. Assuming there is no friction between the boat and the water, find how far the dog is then from the shore?

Thank you so much!!
I would just love the equations/steps to follow
 
Work = (3.5 x 9.8) x 2.6m, = 89.18 joules.
81.98/ (15 x 9.8) = 0.56m. the boat moves, away from shore.
Total distance = (6.1 + .56) = 6.66m. from shore.
 
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