<br> Given above is a line segment, the ratio of $\overline{PQ}$ to the length of $\overline{QR}$ is $2:5$. If it be determined, what is the ratio of the length of $\overline{PQ}$ to the length $\overline{PR}$ ?

Question

$\begin{array}{1 1} (a)\; 5:7 \\(b)\;1:5 \\(c)\; 2:7 \\(d)\; 1:7 \end{array}$