Allan left home at 6:30 am and arrived at school at 8:00 am, so the total time it took him to travel from home to school is:
8:00 am - 6:30 am = 1 hour and 30 minutes
To convert this to hours, minutes, and seconds, we can multiply the decimal part of the minutes by 60 to get the number of seconds:
0.30 x 60 = 18 seconds
Therefore, Allan took 1 hour, 30 minutes, and 18 seconds to travel from home to school.