Final answer:
The second hole is 1/3 as far from ground level as the first hole, which is at -6 1/4 ft. Upon calculation, the depth of the second hole is -2 1/12 ft, option C.
Step-by-step explanation:
The bottom of the second hole is located at a position relative to ground level that is one-third the distance of the first hole. Since the first hole is at -6 1/4 ft, we need to find one-third of that distance. To do this, we convert the mixed number to an improper fraction: -25/4 ft. Then we divide by 3 to find the depth of the second hole:
-25/4 ÷ 3 = -25/12 ft
Now we express -25/12 ft as a mixed number to get the final answer:
-2 1/12 ft
The bottom of the second hole is therefore -2 1/12 ft from ground level, which is option C.