Answer :

[tex]\frac{1}{6}\ ft\ to\ \frac{1}{3}\ h\Rightarrow\frac{1}{6}:\frac{1}{3}\ ft/h=\frac{1}{6}\times\frac{3}{1}\ ft/h=\frac{1}{2}\ ft/h=0.5\ ft/h[/tex]

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