The time in Pittsburgh is 3 hours more than the time in San Diego
Then when the plane departs from San Diego at 7: 30 a.m.
The time in Pittsburgh will be 7: 30 + 3 hours = 10: 30 a.m.
The plane takes 4 1/2 hours
Then we will add 10: 30 a.m. by 4 hours and 30 minutes
10 + 4 = 14 and 30 + 30 = 60 minutes which = 1 hour
Then 14 + 1 = 15
The time 15 is 3: 00 p.m.
This means after 10 a.m 11, 12, 1, 2 p.m and another 1 hour from the minutes part will make the answer 3 p.m.
The arrival time in Pittsburgh is 3 p.m.