Question:
Anupama takes 125 minutes in walking a distance of 100 metre. What distance would she cover in 315 minutes?
Solution:
Let the distance travelled in 315 minutes be x km.
If the distance travelled is more, the time needed to cover it will also be more.
Therefore, it is a direct variation.
We get:
$125: 315=100: x$
$\Rightarrow \frac{125}{315}=\frac{100}{x}$
Applying cross muliplication, we get:
$x=\frac{100 \times 315}{125}$
$=252$
Thus, Anupama would cover 252 metre in 315 minutes.