Answer
50 drops/min
Work Step by Step
Flow rate is expressed as drops per minute. Use conversion factors (equal ratios) to convert the given values.
$\frac{1200\ mL}{6\ hr}=\frac{1200\ mL}{6\ hr}\times\frac{15\ drops}{1\ mL}\times\frac{1\ hr}{60\ min}=\frac{18000\ drops}{360\ min}=\frac{18000\div360\ drops}{360\div360\ min}=\frac{50\ drops}{1\ min}$
