The hcp has ordered cefazolin 500 mg ivpb every 6 hours. the pharmacy sends cefazolin 500 mg in 50 ml of d5/w and it is to run over 1 hour via an infusion pump. the drop factor of the ivpb set is 60 gtt per ml. whats the hourly rate? what would the hourly rate be if the hcp ordered it to run over 30 minutes?