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:

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

Resultant Speed = p-q km/hr

distance = 1 km

Time = r hours

r = 1/(p-q)

p-q = 1/r

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