When a thunder and lightning storm approaches, you can calculate approximately how far away the storm is (in miles) by counting the time between seeing the lightning and then hearing the thunder. The table below shows the relationship between the seconds counted and how far away the storm is.

Seconds counted	$5$	$10$	$15$	$25$	$30$
Distance from storm (miles)	$1$	$2$	$3$	$5$	$6$

If you are $10$ miles away from a storm, how many seconds would you expect to count between seeing the lightning and hearing the thunder?

Write the algebraic expression for the following.

$2$ more than $3$ times of $a$

The diameter of a circle is a line which joins two points on the circle and also passes through the centre of the circle. (In the below figure $\mathrm{AB}$ is a diameter of the circle; $\mathrm{C}$ is its centre). Express the diameter of the circle ($d$) in terms of its radius ($r$).

Write the algebraic expression for the following.

Sum of numbers $p$ and $2$ subtracted from the product of $A$ and $B$.

If Rohan spends $₹x$ every day and saves $₹y$ every week, what is his income in (₹) three weeks? How can you help your parents by saving money?