The rainfall recorded on a certain day was $5 \mathrm{cm}$. Find the volume of water that fell on a $2-\mathrm{hectare}$field.

A river $2 \mathrm{m}$ deep and $45 \mathrm{m}$ wide is flowing at the rate of $3 \mathrm{km}/\mathrm{h}$. Find the quantity of water that runs into the sea per minute.

A pit $5 \mathrm{m}$ long and $3.5 \mathrm{m}$ wide is dug to a certain depth. If the volume of earth taken out of it is $14 {\mathrm{m}}^3$, what is the depth of the pit?

A rectangular water tank is $90 \mathrm{cm}$ wide and $40 \mathrm{cm}$ deep. If it can contain $576 \mathrm{litres}$ of water, what is its length?

A beam of wood is $5 \mathrm{m}$ long and $36 \mathrm{cm}$ thick. It is made of $1.35 {\mathrm{m}}^3$ of wood. What is the width of the beam?

The volume of a room is $378 {\mathrm{m}}^3$ and the area of its floor is $84 {\mathrm{m}}^2$. Find the height of the room.

A swimming pool is $260 \mathrm{m}$ long and $140 \mathrm{m}$ wide. If $54600 \mathrm{cubic} \mathrm{metres}$ of water is pumped into it, find the height of the water level in it.

Find the volume of wood used to make a closed box of outer dimensions $60 \mathrm{cm}\times 45 \mathrm{cm}\times 32 \mathrm{cm}$, the thickness of wood being $2.5 \mathrm{cm}$ all around.

Find the volume of iron required to make an open box whose external dimensions are $36 \mathrm{cm}\times 25 \mathrm{cm}\times 16.5 \mathrm{cm}$, the box being $1.5 \mathrm{cm}$ thick throughout. If $1 {\mathrm{cm}}^3$ of iron weighs $8.5 \mathrm{grams}$, find the weight of the empty box in $\mathrm{kilograms}$.