the school day consists of four block classes, each 90 mins long. Lunch is 30 mins. Passing time between classes and/or lunch is 5 mins.
1) if there is a fire drill at a random time during the day, what is the probability that is begins during lunch?
2) At a random time during a class, your teacher poses the "Question of the Day." If you are 10 mins late for class, what is the probability that you miss hearing the question?

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The school day is 90 + 90 + 90 + 90 + 30 + 5 + 5 + 5 + 5 = 410 minutes.
1. 30/410 = 3/41

:+)

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