A square has sides of $30 cm$ . What is its area in square metres?

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A train travels at $72 km/h$ . What is its speed in metres per second?
A block has mass $540 g$ and volume $200 cm^{3}$ . What is its density in $kg/m^{3}$ ?
A quantity is $X = \frac{m v ^{2}}{r}$ with $m$ in kg, $v$ in m/s and $r$ in m. What are the base units of $X$ ?
The speed of light is about $3 \times 1 0^{8} m/s$ . How far, in kilometres, does light travel in $2 \times 1 0^{- 3}$ seconds?
Which length is equal to $3.5 \times 1 0^{- 3}$ megametres? (1 Mm $= 1 0^{6}$ m)
A tap delivers $0.5$ litres per second. How many cubic metres does it deliver in $2$ hours? ( $1 m^{3} = 1000$ litres)