[計量] At a certain school,
At a certain school, the school day begins at 8:15 a.m.
and ends at 3:15 p.m. The day consists of a 10 minute
homeroom period, a 45 minute lunch periodm and 8 class
periods. If the students are allowed 5 minutes to pass
from one room to the next after each period except the last,
how many minutes long is each class period?
A) 35
B) 40
C) 42
D) 45
E) 50
Ans: B
可以教我一下這個答案怎麼計算出來的嗎？ thx
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