Devin M.

asked • 04/04/15

How do I solve this for Algebra 2 on the topic of Arithmic Sequences?

"Suppose a trolley stops at a certain intersection every 14 min. The first trolley of the day gets to the stop at 6:43 am. how long do you have to wait for a trolley if you get to the stop at 8:15 am? At 3:20 pm?

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Mark M. answered • 04/05/15

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It is 92 minutes from 6:43 to 8:15.
During that time the trolley arrives 6 times, that last one after 84 minutes.
You have to wait 8 minutes.
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Matt H.

I think if you arrive at 8:15, you only have to wait 6 more minutes.
 
If you just miss the one at 84 minutes (which would be at 8:07), the next one would come at 98 minutes, which would be at 8:21, six minutes after you get to the stop at 8:15.

It's also possible that my brain missed the coffee trolley this morning, but I think it works out this way... :-)
 
Cheers,
 
Matt
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04/05/15

Mark M.

Matt H.
 
Yes, you are correct. I added instead of subtracted.
 
Thank you.
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04/05/15

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