To find out how many pages Lizbeth read in one minute, we can use the formula:
\[ \text{Pages per minute} = \frac{\text{Total pages}}{\text{Total time in minutes}} \]
In this case, Lizbeth read 50 pages in 75 minutes. Plugging in the values:
\[ \text{Pages per minute} = \frac{50 \text{ pages}}{75 \text{ minutes}} = \frac{50}{75} = \frac{2}{3} \approx 0.67 \text{ pages per minute} \]
Thus, Lizbeth read approximately 0.67 pages per minute.
The correct choice from the responses you provided is:
0.67 pages/minute.