Center of Mass Problem | A 3.0 kg cat is in a 24 kg boat...

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A 3.0 kg cat is in a 24 kg boat. The cat is 10 m from the shore. The cat walks 3.0 m toward the shore. How far is the cat from the shore? Assume that the center of mass remains constant, and that there is no friction between boat and water.
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If try to solve this problem via rules of conservation of momentum:

Mass of cat * distance travelled by cat = -Mass of boat * distance travelled by boat
3kg * 3m = -27kg * d
d = -9/27 = -0.375m

So cat is: 10m - 3m + 0.375m = 7.375m far from the shore.

But the result is slightly different from the result from the video. Can you explain why?

EldarIusupzhanov