If x = 2 + $\sqrt{3}$, then the value of $x^{2}$ - $\dfrac{1}{x^{2}}$ Χ
14
8$\sqrt{3}$
4 $\sqrt{3}$
0
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The distance between two places is 61 km. If a two wheeler takes hours to cross the distance, then what is the speed of the two wheeler?