Problem C14:
A boy of mass n_{2} is sitting at the extreme left edge of a boat
that has a mass of n_{1}. The length of the boat is L.
The boy then moves to the extreme right edge of the boat, and the
boat moves to the left. How much does the boat move to the left?
If the boat moves a distance of x=L/n_{3},
what is the value of n_{3}. Note that n_{1} and n_{2}
have the same units of mass. n_{3} is unitless. Assume that there
is no horizontal friction between the water and the boat.

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