The elevation of the hole relative to the ground is 52.5 feet.
The given parameters;
The depth of the hole after 30 minutes digging by Joe is calculated as;
[tex]depth \ of \ hole = \frac{35 \ ft}{10 \min} \times 30 \min = 105 \ ft[/tex]
The new depth of the hole after placing bush that fills half of it;
[tex]new \ depth = \frac{1}{2} \times 105 \ ft\\\\new \ depth = 52.5 \ ft[/tex]
Thus, the elevation of the hole relative to the ground is 52.5 feet.
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