$A$ boy is running at a speed of $p \, km/h$ to cover a distance of $1 \, km$. However,due to the slippery ground,his speed is reduced by $q \, km/h$ $(p > q)$. If he takes $r$ hours to cover the distance,then:
- A$\frac{1}{r} = \frac{1}{p} + \frac{1}{q}$
- B$\frac{1}{r} = p - q$
- C$r = p + q$
- D$r = p - q$
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