In the given figure,$P$ is $300 \, km$ eastward of $O$ and $Q$ is $400 \, km$ north of $O$. $R$ is exactly in the middle of $Q$ and $P$. The distance between $Q$ and $R$ is (in $, km$)

Sudheesh walked $10 \, m$ towards south. He turned left and walked $20 \, m$ and then moved to his right. Then he turned right and walked $20 \, m$. Finally he turned right and moved a distance of $10 \, m$. How far and in which direction is he from the starting point?

Point $D$ is $14 \,m$ towards the West of point $A$. Point $B$ is $4 \,m$ towards the South of point $D$. Point $F$ is $9 \,m$ towards the South of point $D$. Point $E$ is $7 \,m$ towards the East of point $B$. Point $C$ is $4 \,m$ towards the North of point $E$. Point $G$ is $4 \,m$ towards the South of point $A$. Which of the following points are in a straight line?

Gaurav walks $20 \, m$ towards North. He then turns left and walks $40 \, m$. He again turns left and walks $20 \, m$. Further,he moves $20 \, m$ after turning to the right. How far is he from his original position (in $, m$)?

$A$ man walked $30 \, m$ towards south. Then,he turned to his right and walked $30 \, m$. Then,he turned to his left and walked $20 \, m$. Again,he turned to his left and walked $30 \, m$. How far is he from his initial position?

$A$ starts crossing a field diagonally. After walking half the distance,he turns right,walks some distance,and then turns left. Which direction is $A$ facing now?