Question

Davis digs a hole at a rate of 3/4 feet every 10 minutes. After digging for 40 minutes, Davis places a bush in the hole that fills exactly 78 feet of the hole.

Answer 1

The elevation of the hole relative to the ground level is; $58$ feet.

Davis digs the hole at a rate of $34$ feet every $10$ minutes.

After $40$ minutes, he must have dug the hole up to: $34 \times 4 = 136$ feet

Davis places a bush in the hole that fills exactly $78$ feet of the hole.

So, the elevation of the hole relative to the ground level is;

$136 - 78 = 58$ feet

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