Time taken to make \((pq)\) metres of cloth = \(r\) min
Time taken to make 20,000 m of cloth = \(\frac{r}{pq} \times 20,00,000\) mintues
Therefore, Required time (in hour) =\(20,00,00 \times 60(\frac{r}{pq})\)
The correct answer is (D) : 20000 r/60 (pq)