Question

A car takes $5$ hours to reach a destination by travelling at the speed of $60km/hr$. How long will it take when the car travels at the speed of $75km/hr$?

Answer 1

If the speed of the car is more, time required is less to travel. Therefore it's inversely proportional.

Let us consider the required time be $x$ hours, then

$5\times 60=75\times x$

$x=(5\times 60)/75=4$

$\therefore 4$ hours are required.