Answer:
In Python:
def MPH(miles,minutes):
    mph = round(60 * miles/minutes,1)
    return mph
    
miles = float(input("Miles: "))
minutes = float(input("Minutes: "))
if miles>0 and minutes>0:
    print("MPH: ",MPH(miles,minutes))
else:
    print("Positive inputs only")
Explanation:
This defines the function
def MPH(miles,minutes):
This calculates mph rounded to 1 decimal place
    mph = round(60 * miles/minutes,1)
This returns the calculated mph
    return mph
The main begins here
This gets input for miles    
miles = float(input("Miles: "))
This gets input for minutes
minutes = float(input("Minutes: "))
If miles and minutes are positive
if miles>0 and minutes>0:
This calls the MPH function
    print("MPH: ",MPH(miles,minutes))
If otherwise, this prompts the user for positive inputs
<em>else:</em>
<em>    print("Positive inputs only")</em>