Step-by-step explanation:
Volume of intravenous solution to be delivered = 50 mL
1) Rate of drops per milliliter of the solution = r = 60 drops/mL
Number of drops delivered :
![60 drops/mL* 50 mL = 3000 drops](https://img.qammunity.org/2020/formulas/chemistry/high-school/m8diw1z4tjmquuxltry7d50nzaalv8hrt8.png)
Time required to deliver 3000 drops = t
Rate of drop solution with respect to time = R = 1 drop/second
![(3000 drop)/(t)=1 drop/s](https://img.qammunity.org/2020/formulas/chemistry/high-school/j6dczay15bx4ewxme9f94gtevndg4hn3dd.png)
t = 3000 seconds = 50 minutes (1 min = 60 seconds)
Number of drops delivered 3000.
50 minutes are required to deliver 50 mL of intravenous solutions.
2) Rate of drops per milliliter of the solution = r = 15 drops/mL
Number of drops delivered :
![15 drops/mL* 50 mL = 750 drops](https://img.qammunity.org/2020/formulas/chemistry/high-school/h8c9j2pi1k80uelzzb9oycxo8tdqyb8e4b.png)
Time required to deliver 750 drops = t
Rate of drop solution with respect to time = R = 1 drop/second
![(750 drop)/(t)=1 drop/s](https://img.qammunity.org/2020/formulas/chemistry/high-school/f04in10ttg592eyjmccfjzf43oh80ksv7l.png)
t = 750 seconds = 12.5 minutes (1 min = 60 seconds)
Number of drops delivered 750 .
12.5 minutes are required to deliver 50 mL of intravenous solutions.