A boy is running at a speed of p km/h to cover a distance of 1 km but due to slippery ground his speed is reduced by q km/h (p > q). If he takes r hours to cover the distance, which of the following condition is true:

$\frac{1}{r}= (p-q)$ $r= (p-q)$ $r=\frac{1}{p+q}$ $r=p+q$

$\frac{1}{r}= (p-q)$

The correct answer is Option (1) → $\frac{1}{r}= (p-q)$