The distribution of people at 1 pm. is given by

[ 0  300   600 ] 1 0 0 0 1/2 1/2 1/6 1/3 1/2 = [ 100   350   450 ].

Thus, there are 100 people at the jetty, 350 people at the swimming area, and 450 people at the volleyball area by 1 pm.

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