Answer: She would need 40 minutes to infuse a dose.
Explanation:
Since we have given that
Number of minutes a nurse takes to infuse a dose = 50 minutes
Rate faster by 20%
So, if the initial rate = 100%
After increasing the rate,
rate becomes 100%-20% = 80%
So, Number of minutes taken to infuse a dose now is given by
![(80)/(100)* 50\\\\=0.8* 50\\\\=40\ minutes](https://img.qammunity.org/2020/formulas/mathematics/college/94wsp5c25o4vygro83nhdokqo9exgrjvhe.png)
Hence, she would need 40 minutes to infuse a dose.