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Old 04-01-2009   #1
Will
 
Join Date: Mar 2009
Posts: 3
Lightbulb Probablity (do I miss the bus)

Math word problem:

You are arriving at the bus stop at 2:41 p.m. and need to arrive at your destination at 2:57 p.m.

The bus ride is a 13 minute ride.
The bus comes every 10 minutes (however, you don't know which minute of the ten minutes you are currently at)

So what are the chances that you arrive on time?

I said that have a three minute window of opportunity, but the teacher said four, because evidently I'm not late if I make it anytime in the 2:57 p.m. minute, I can live with that, but he wants to make it out of the sixteen minutes and this seems illogical to me, because my understanding of the basic equation is "what are the chances that I arrive in the window of opportunity (3 or 4 minutes) that the bus arrives (which be equation will be from 0-10 minutes -- either inclusive 11 minutes or exclusive 10 minutes).

Can someone give me some ammunition to take to class to prove to the teacher that it is not 4 out of 16?
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