Final answer:
This indicates that, on average, 1 and 1/4 millimeters of rain falls every hour. It's crucial to understand unit rates to interpret and compare different rates consistently. the correct option is (c).
Step-by-step explanation:
To find the unit rate, divide the total amount of rain by the total time. In this case, the unit rate is the amount of rain per hour. If the total amount of rain is 1 and 1/4 millimeters and the total time is 1 hour, the unit rate is 1 and 1/4 millimeters per hour. Mathematically, it can be represented as 1 and 1/4 millimeters / 1 hour, which simplifies to 1 and 1/4 millimeters per hour.
Therefore, the correct unit rate for the amount of rain in millimeters per hour is option c, 1 and 1/4 millimeters per hour. This indicates that, on average, 1 and 1/4 millimeters of rain falls every hour. It's crucial to understand unit rates to interpret and compare different rates consistently.