Question

Meenakshee cycles to her school at an average speed of 12 km/hr and takes 20 minutes to reach her school. If she wants to reach her school in 12 minutes, then what should be her average speed?

Answer 1

Higher is the speed, lesser will be the time taken to cover the same distance.
Hence, it is a case of inverse proportion.

$\begin{array}{ccc}Speedofcar\left(km/hr\right)& 12& X\\ Timetaken\left(mins\right)& 20& 12\end{array}$

$\Rightarrow \frac{12}{20}=\frac{12}{x}$

$\Rightarrow x=20km/hr$