15 mL of 10% Calcium Gluconate injection and 10 mL of a multivitamin infusion are mixed with 500 mL of NSS. The infusion is to be administered over a period of 5 hours. If the infusion set is calibrated at 15 drops per mL, at what rate in drops per minute should the flow rate be adjusted in order to administer the infusion over the desired time interval?