Help with calculating flow rate

0 1. A 50 mL IV is to infuse in 15 minutes. The set calibration is 15gtt/mL. After 5 minutes, the IV contains 40 mL. Calculate the flow rate to deliver the volume on time.
2. An IV of 1000mL is ordered to run at 25mL/hr using a microdrip setLast edit by EmilyEmily on Mar 15, '13 

Mar 15, '13 by Esme12, ASN, BSN, RN Senior ModeratorWe are happy to help with home work but we will not do it for you....show us what you think the answer is and show me how you got that answer so I can know where best to help you.
This web site may help you. DosageHelp.com  Helping Nursing Students Learn Dosage Calculations 
Mar 15, '13 by EmilyEmilyI keep coming up with the wrong answer I just need someone to explain it to me by setting it up

Mar 15, '13 by KelRN215, BSN, RNQuote from EmilyEmilyShow us what you are doing and we can help you find what you're doing wrong.I keep coming up with the wrong answer I just need someone to explain it to me by setting it up

Mar 15, '13 by EmilyEmily1. 40mL/10min x 15gttI get the wrong answer for this
2. 975mL x 60 min ?? 
Mar 15, '13 by KelRN215, BSN, RNQuote from EmilyEmilyOk, look at what you are doing here.1. 40mL/10min x 15gttI get the wrong answer for this
2. 975mL x 60 min ??
For #1, You need to infuse 40 mL in 10 min, I agree. So what does that mean, 4 mL/min, right?
So 4 mL/min x your drop factor of 15 gtts/mL = ? gtts/min.
For #2, where are you getting 975 mL from? Your problem is:
An IV of 1000mL is ordered to run at 25mL/hr using a microdrip set
Why would you subtract 25 mL from 1000 mL? That is not a step to figure this out.
Do you know what a microdrip set is? You need to know that to work this problem.
You don't say in this question what they are looking for the gtts/min? If so, the 1,000 mL is irrelevant. You are running an IV at 25 mL/hr. How do you get from that to drops/min? 
Mar 16, '13 by Esme12, ASN, BSN, RN Senior ModeratorDosageHelp.com  Helping Nursing Students Learn Dosage Calculations  Volume/Time  IV Drop Rate Questions
Volume(mL) Time (min) x Drop Factor (gtts/mL) = Y (Flow Rate in gtts/min) ..
40ml
10min x 15gtts/1ml = _____gtts/min
(40ml divided by 10min = 4ml then that answer 4ml x (times) 15gtts (the gtt rate) Will give you 60 gtts/min.
For the second......define what a micro gtt is...what is the gtt factor for a micro gtt?
25ml
60min (60 min to 1 hour) x 60ggts/min = _____ml/cc/hrLast edit by Esme12 on Mar 16, '13