Answer
112.5 drops/min
Work Step by Step
Flow rate is expressed as drops per minute. Use conversion factors (equal ratios) to convert the given values.
$\frac{900\ mL}{2\ hr}=\frac{900\ mL}{2\ hr}\times\frac{15\ drops}{1\ mL}\times\frac{1\ hr}{60\ min}=\frac{13500\ drops}{120\ min}=\frac{13500\div120\ drops}{120\div120\ min}=\frac{112.5\ drops}{1\ min}$
