Julia, an archaeology student, needs to dig 6 cylindrical pits at an archaeological site. Each pit will be 8 feet in diameter and 6 feet deep. Since she needs to work slowly and carefully, Julia can remove dirt at an average rate of 3 cubic feet per hour. Which of the following values is closest to the number of hours it will take Julia to dig all 6 pits?

(Note: The volume, \(V\), of a cylinder with radius \(r\) and height \(h\) is \(V=\pi r^2h\); \(\pi\approx 3.14\).)

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The volume of all cylinders is:

$$ 6V_{\text{cylinder}}=6\cdot \pi r^2 h $$ $$ = 6\pi(4)^26 \approx 1810 $$

Since the rate is 3 cubic feet per hour,

$$ \frac{1810}{3} \approx \boxed{600} $$