Answer:
60.4 ft deep
Explanation:
17% = .17
40 * .17 = 6.8 per hour
6.8 * 3 = 20.4
20.4 + 40 = 60.4 ft deep
91 feet or 51
17x 3= 51
51 + 40(what she dug before)
or it's just 51
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