Find the perimeter of a blackboard with a length of $240$ cms and breadth $120$ cms.

Write the answer in centimetres.

There are two concentric circles. The radii of the two circles are $100 \mathrm{m}$ and $110 \mathrm{m}$ respectively. A wheel of radius $30 \mathrm{cm}$ rolls on the smaller circle and another wheel rolls on the larger circle. After they have completed one revolution, it is found that the two wheels rolled equal number of times on their respective axes. What is the radius of the other wheel?

Consider the following

There are seven places marked as P, Q, R, S, T, U and V as shown in the diagram. The directly connected paths between two places are indicated by line segments joining the two places along-with the length labelled (in km). Then, the shortest distance between P and U is

A circular coil of radius $1 \mathrm{cm}$ is allowed to roll freely on the periphery over a circular disc of radius $10 \mathrm{cm}$. If the disc has no movement and the coin completes one revolution rolling on the periphery over the disc and without slipping, then what is the number of times the coin rotated about its centre?

The length of rectangle is $80\%$ of diagonal of square of area $1225 {\mathrm{m}}^2$, then find area of rectangle, if it's perimeter is $94\sqrt{2} \mathrm{m}$.