Answer: r = 1.5 h 
Explanation:
Hi, to answer this question we have to write an equation with the information 
Rainfall rate= 1.5 inches per hour 
h = hours 
So, to calculate Saturday's rainfall rate (r) we have to multiply the rain rate (1.5) by the number of hours passes (h). 
Mathematically speaking: 
r = 1.5 h 
Feel free to ask for more if needed or if you did not understand something.