The HCP orders Zantac 50 mg IV every 6 hours for ulcers. The pharmacy delivers 25 mg/ml. The nurse will dilute in 50 mL of 0.9% NS to infuse over 30 minutes. No IV pump available. Need to administer...

The HCP orders Zantac 50 mg IV every 6 hours for ulcers.  The pharmacy delivers 25 mg/ml.  The nurse will dilute in 50 mL of 0.9% NS to infuse over 30 minutes.  No IV pump available. Need to administer via gravity.  IV administration set available is a drop factor of 15

What is the rate?  Numeric value only.