An aurcraft in level and unaccelerated flight with a velocity of $v_{\infty}=300 \mathrm{~m} / \mathrm{s}$ requires a power of $9 \times 10^{6} W$. If the aircraft weighs $1.5 \times 10^{5} \mathrm{~N}$, the lift-to-drag ratio $\frac{L}{D}$ is____________

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An aurcraft in level and unaccelerated flight with a velocity of $v_{\infty}=300 \mathrm{~m} / \mathrm{s}$ requires a power of $9 \times 10^{6} W$. If the aircraft weighs $1.5 \times 10^{5} \mathrm{~N}$, the lift-to-drag ratio $\frac{L}{D}$ is____________