a) $$\frac{{20000{\text{pq}}}}{{\text{r}}}$$
b) $$\frac{{20000{\text{rq}}}}{{\text{p}}}$$
c) $$\frac{{20000{\text{r}}}}{{{\text{pq}}}}$$
d) $$\frac{{20000{\text{r}}}}{{60{\text{pq}}}}$$
Answer: d
Explanation: Length of the cloth produced in 1 hour
$$\eqalign{
& {\text{ = }}\left( {\frac{{{\text{pq}}}}{{\text{r}}} \times 60} \right){\text{ m }} \cr
& = \left( {\frac{{60{\text{pq}}}}{{\text{r}}}} \right){\text{ m}} \cr
& {\text{Required time}} \cr
& = \left( {20000 \div \frac{{60{\text{pq}}}}{{\text{r}}}} \right){\text{ hours }} \cr
& {\text{ = }}\left( {\frac{{20000{\text{r}}}}{{60{\text{pq}}}}} \right){\text{ hours}} \cr} $$
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