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A boy is running at a speed of p kmph to cover a distance of 1 km. But, due to the slippery ground, his speed is reduced by q kmph (p > q). If he takes r hours to cover the distance, then:

A boy is running at a speed of p kmph to cover a distance of 1 km. But, due to the slippery ground, his speed is reduced by q kmph (p > q). If he takes r hours to cover the distance, then: Correct Answer $$\frac{1}{r} = p - q$$

$${\text{Speed }} = \frac{{{\text{Distance }}}}{{{\text{Time}}}}$$    or
$$\frac{{{\text{Distance }}}}{{{\text{Time}}}} = {\text{Speed}}$$
⇒ $$\frac{1}{r} = p - q$$

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