Cloth Makers Inc. has p spindles, each of which can produce q metres of cloth on an average in r minutes. If the spindles are made to run with no interruption, then how many hours will it take for 20,000 meters of cloth to be produced?

A

$$20000 \frac{(pq)}{r}$$

B

$$20000 \frac{(rq)}{p}$$

C

$$\frac{(pr)}{pq}$$

D

$$20000 \frac{r}{60 (pq)}$$