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Speed

Manisha cycle...

Question

Manisha cycles to her school at an average speed of 15 km/hr and takes 30 minutes to reach her school. If she wants to reach her school in 15 minutes, then what should be her average speed?

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Solution

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

$\begin{matrix} S p e e d o f c a r (k m / h r) & 15 & X T i m e t a k e n (m i n s) & 30 & 15 \end{matrix}$

$\Rightarrow \frac{15}{30} = \frac{15}{x}$

$\Rightarrow x = 30 k m / h r$

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