Question

Question 09.
A car takes 2 hours to reach a destination by travelling at the speed of 60 km/hr. How long will it take when the car travels at the speed of 80 km/hr?

Answer 1

Let the number of hours be x.
$\begin{array}{ccc}Speed\left(inkm/hr\right)& 60& 80\\ Time\left(inhours\right)& 2& x\end{array}$
Here, the speed of car and time are in inverse proportion.

$\therefore \frac{60}{80}=\frac{x}{2}\Rightarrow x\times 80=60\times 2\Rightarrow x=\frac{60\times 2}{80}=\frac{3}{2}=1\frac{1}{2}hrs.$

Hence, the car will take $1\frac{1}{2}$ hours to reach its destination.