Question

With a speed of 60 km/h, a car takes 4 hours to cover a certain distance.
Enter the speed of the car in km/h, if the same distance has to be covered in 3 hours.

• A. 80

Answer 1

The correct option is A 80
Given, at a speed of 60 km/h a car takes 4 hours to cover a certain distance.

Also, as the speed increases, the time taken to cover the same distance would reduce. Hence, they are inversely related.

Let the speed of the car be $x$ km/h when it has to cover the distance in 3 hours.
According to inverse proportion,
$\frac{60}{x}=\frac{3}{4}x=\frac{60\times 4}{3}$

$\Rightarrow x=80$

Hence, the required speed is 80 km/h.