Everyday Math: How to know what time it would it be x hours from now

Here is a simple calculation for everyday living.

Examples:
What time would it be 7.5 hours after 9:30AM?
What time would it be 8 hours after 10:30AM?

Solution
1. Compute CurrentTime+TimeToElapse
2. If the Sum is less than or equal to 12:00, the Sum is your answer.
3. If the Sum is more than or equal to 12:00:
a. Subtract 12:00 from the Sum
b. Switch from AM to PM or PM to AM depending on the which side CurrentTime is

Examples
Example1
7.5 hours after 2:00PM
2:00+7:30=9:30PM (we don't switch from PM to AM since the Sum is less than 12:00)

Example2
7.5 hours after 9:30AM
9:30+7:30=17:00
17:00 is greater than 12:00 
So we subtract 12:00 from the Sum -> 17:00-12:00=5:00
Then we switch from AM to PM
Therefore the answer is 5:00PM

Example3
8 hours after 10:30AM
10:30+8:00=18:30
18:30-12:00=6:30
Switch from AM to PM: Answer is 6:30PM