The school day is 6 hours and 50 mins long.
Given to us,
school starts at 8:30 a.m.
ends at 3:20 p.m.,
To understand it easier, Let's round of the time to the nearest values,
8:30 a.m. ≈ 9:00 A.m.
3:20 p.m. ≈ 3:00 p.m.
Now, as we can see at 8:30 a.m. to 9:00 A.m., there is an extra time of 30 mins while at 3:20 p.m. to 3:00 p.m., there is an extra time of 20 mins, therefore we will have an extra time of 50 mins overall if we calculate the time from 9:00 A.M. to 3:00 p.m.
Calculation
dividing the time from 9:00 a.m. to 3:00 p.m. into two parts,
9:00 a.m. to 3:00 p.m = 9:00 a.m. to 12:00 p.m + 12:00 p.m. to 3:00 p.m
From 9:00 a.m. to 12:00 p.m the difference is of 3 hours, and the difference from 12:00 p.m. to 3:00 p.m is also 3 hours.
Therefore, the time between 9:00 a.m. to 3:00 p.m is of six hours but we also have extra 50 mins left.
Hence, the school day is 6 hours and 50 mins long.
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