Answer:
rate of infusion is 50 gtt/min
Step-by-step explanation:
given data 
infuse = 150 mL
time = 45 min
delivers = 15 gtt/mL 
to find out 
rate of infusion
solution
we will apply here formula for rate that is
rate = infuse × delivers / time .............................1
put here all these value 
so 
rate = 150 × 15 / 45 
rate = 2250 /45
rate = 50 
so rate of infusion is 50 gtt/min