Here ,
let the distance moved by the boat is x
as the center of mass will not change it's position
45 * (6.4 - x) - 45 * x = 0
solving for x
x = 3.2 m
distance of child from pier = 7.4 + 6.4 - 3.2
distance of child from pier = 10.6 m
the distance of child from pier is 10.6 m
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