(a(i))[3]
Martha travels at an average speed of $5.2\,\text{km h}^{-1}$. Calculate the time Martha needs to complete one circuit of the field. Give your answer correct to the nearest minute.
(a(ii))[3]
Show that the bearing of $D$ from $A$ is $245^{\circ}$, accurate to $3$ significant figures.
(b)[5]
In triangle $PQR$, point $S$ lies on $PR$. $PS = 10.3\,\text{cm}$, $QR = 12.6\,\text{cm}$, $\angle QPS = 42^{\circ}$ and $\angle QRS = 35^{\circ}$. Calculate $QS$.