A tacheometer was placed at point $\mathrm{P}$ to estimate the horizontal distances $\mathrm{PQ}$ and $\mathrm{PR}$. The corresponding stadia intercepts with the telescope kept horizontal, are $0.320 \mathrm{~m}$ and $0.210 \mathrm{~m}$, respectively. The $\angle \mathrm{QPR}$ is measured to be $61^{\circ} 30^{\prime} 30^{\prime \prime} .$ If the stadia multiplication constant $=100$ and stadia addition constant $=0.10 \mathrm{~m},$ the horizontal distance (in $\mathrm{m}$ ) between the points $\mathrm{Q}$ and $\mathrm{R}$ is
A tacheometer was placed at point $\mathrm{P}$ to estimate the horizontal distances $\mathrm{PQ}$ and $\mathrm{PR}$. The corresponding stadia intercepts with the telescope kept horizontal, are $0.320 \mathrm{~m}$ and $0.210 \mathrm{~m}$, respectively. The $\angle \mathrm{QPR}$ is measured to be $61^{\circ} 30^{\prime} 30^{\prime \prime} .$ If the stadia multiplication constant $=100$ and stadia addition constant $=0.10 \mathrm{~m},$ the horizontal distance (in $\mathrm{m}$ ) between the points $\mathrm{Q}$ and $\mathrm{R}$ is