Question

A car takes $7$ hours to cover a certain distance at the speed of $48$ km/h. If the speed is decreased by $20$ km/h, how much time will it take to cover the same distance?

Answer 1

Let Distance covered $=x$ km.

We know that,

$Speed=\frac{Distance}{Time}$

$\Rightarrow x=48\times 7km$.

Now

Speed = $48-20=28km/h$

$Time=\frac{Distance}{Speed}=\frac{48\times 7}{28}=12hours$