A talcum powder is available in two packs, a tin can with a square base of side $6 \mathrm{cm}$ and height $10 \mathrm{cm}$ and a tin can of a circular base of radius $3.5 \mathrm{cm}$ and height $12 \mathrm{cm}$. Which of them has greater volume and by how much?

A water tanker is in the shape of a cylinder whose radius is $2 \mathrm{m}$ and length is $14 \mathrm{m}$. How many litres of water can it store? (Hint:$1 {\mathrm{m}}^3=1000 \mathrm{litres}$)

Water is falling in a cylindrical tank from an inlet pipe at the rate of $10 \mathrm{litres}$ per minute. If the diameter and height of the tank are $1 \mathrm{m} \mathrm{and} 7 \mathrm{m}$, respectively, find the time required to fill the tank.