Question

R is the midpoint of PS.Q is the midpoint of PR. PR=3. what is the length of QS

Answer 1

Since $Q$ is the midpoint of $PR$ , $PR=2QR$, and thus $QR=\frac{PR}{2}=\frac{3}{2}=1.5$. Taking into account that $R$ is the midpoint of $PS$ we conclude that $RS=PR=3$. Therefore, $QS=QR+RS=1.5+3=4.5.$