13 hours
2 hours
It is 3 hours
6 hours
9
10.5
It is 8 hours from 9am to 5pm. To calculate it, first find out how long it is from 9am to noon (3 hours) and then from noon to 5pm (5 hours). Simply add the two together to find your answer of 8 hours.
7 hours and 30 minutes.
9 - 5 = 4 hours
14 Hours.
7.75+24k hours where k is an integer.
8am to 5pm is 9 hours, deduct 1 hour for lunch = 8 hours. If they're both in the same day, then 8am to 5pm is a span of 9 hours, regardless of how you choose to use them.