A well of diameter $3 \mathrm{m}$ is dug $14 \mathrm{m}$ deep. The earth taken out of it is spread evenly all around it to a width of $4 \mathrm{m}$ to form an embankment. Find the height of the embankment.

The vertical height of a conical tent is $42 \mathrm{dm}$ and the diameter of its base is $5.4 \mathrm{m}.$ Find the number of persons it can accommodate if each person is to be allowed $29.16 \mathrm{cubic} \mathrm{dm}$. $(\text{Take} \mathrm{\pi }=22/7)$

If the depth of a cylindrical tank of radius $28 \mathrm{m}$ is $x \mathrm{m}$ and its capacity is equal to that of a rectangular tank of size $28 \mathrm{m}\times 16 \mathrm{m}\times 11 \mathrm{m}$, then find the value of $x$. $\left[\text{Take,} \mathrm{\pi }=\frac{22}{7}\right]$