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March 6, 2015

Posted by **phoebe** on Friday, December 3, 2010 at 12:25am.

A stoplight flashes red for 50seconds, yellow for five seconds, and green for 65 seconds. In a 24 hour period, how long is the light red?

- math, 5th grade -
**drwls**, Friday, December 3, 2010 at 12:32amIt is red 50/(50 + 5 + 65) = 5/12 of the time

5/12 of 24 hours is 10 hours.

- math, 5th grade -
**phoebe**, Friday, December 3, 2010 at 12:36amThank you

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