Answer
$1.56 \frac{\rm{ft}}{\rm{s}}$
Work Step by Step
The hole is $8$ miles deep and it takes $7.5$ hrs to retrieve it. We want the rate in $\frac{\rm{ft}}{\rm{s}}$, which means we need to convert $8$ miles to feet, and $7.5$ hrs to seconds.
$8$ miles $=8\times 5280=42240 \rm{ft}$, and
$7.5 \rm{hrs} =7.5*60*60=27000\rm{s}$.
The rate is therefore $r=\frac{d}{t}=\frac{42240}{27000}\approx 1.56 \frac{\rm{ft}}{\rm{s}}$
