$Q$ walked $20 \, m$ towards West,took a left turn and walked $20 \, m$. He then took a right turn and walked $20 \, m$ and again took a right turn and walked $20 \, m$. How far is $Q$ now from the starting point? (in $m$)

Six flats on a floor in two rows facing North and South are allotted to $P, Q, R, S, T$ and $U$.
$(i)$ $Q$ gets a North-facing flat and is not next to $S$.
(ii) $S$ and $U$ get diagonally opposite flats.
(iii) $R$,next to $U$,gets a South-facing flat and $T$ gets a North-facing flat.
Which of the following combinations get South-facing flats? To arrive at the answer to the above question,which of the following statements can be dispensed with?

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 $, km$)

$P, Q, R$ and $S$ are playing a game of carrom. $P, R$ and $S, Q$ are partners. $S$ is to the right of $R$ who is facing west. Then,$Q$ is facing:

$A$ walks $10 \, m$ in front and $10 \, m$ to the right. Then,every time turning to his left,he walks $5, 15, \text{ and } 15 \, m$ respectively. How far is he now from his starting point? (in $m$)

$A$ postman was returning to the post office which was in front of him to the north. When the post office was $100 \, m$ away from him,he turned to the left and moved $50 \, m$ to deliver the last letter at Shantivilla. He then moved in the same direction for $40 \, m$,turned to his right and moved $100 \, m$. How many metres was he away from the post office? (in $m$)