Solve for V_t, r, L
r = \frac{5 \sqrt[3]{\frac{120 \sqrt{19600 - 63 \pi}}{\pi} + \frac{16800}{\pi} - 27} + 5 \sqrt[3]{-\frac{120 \sqrt{19600 - 63 \pi}}{\pi} + \frac{16800}{\pi} - 27} - 15}{2} \approx 48.511139367
V_{t}=700000
L=30
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