\left\{ \begin{array} { l } { H - 4.9 t ^ { 2 } = 0 } \\ { t = \frac { 39.2 - H } { 39.2 } } \end{array} \right.
Solve for H, t
t=-2\sqrt{6}-4\approx -8.898979486\text{, }H=\frac{392\sqrt{6}}{5}+196\approx 388.039995834
t=2\sqrt{6}-4\approx 0.898979486\text{, }H=-\frac{392\sqrt{6}}{5}+196\approx 3.960004166
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