1986 年

A man drives a car at $45\text{ km/h}$ for $3$ hours and then at $50\text{ km/h}$ for $2$ hours. His average speed for the whole journey is

If the compound interest on $\$1000$ for two years at $9\%$ p.a., paid half-yearly is $\$x$, find $x$.

If $\sin\theta\cos\theta=\dfrac{1}{4}$, then $(\sin\theta+\cos\theta)^2=$

$\sin^4\theta-\cos^4\theta=$

In the figure, $\angle A:\angle B:\angle C=$

In the figure, if the area of the sector is $x$, then arc $ACB=$

The bearing of a lighthouse as observed from an ocean liner is $\text{N}37^\circ\text{E}$, the bearing of the ocean liner as observed from the light house is

Which of the following represents a circle?

In the figure, $L_1$ and $L_2$ are two straight lines perpendicular to each other and intersecting at $P$ on the $y$-axis. If the equation of $L_1$ is $y=ax-5$, then the equation of $L_2$ is

In the figure, $x=$