Homework Help: 8th grade math - Ms. Sue please

Posted by Chris on Friday, November 16, 2012 at 9:41pm.

Charlie and Peter are driving around a racetrack. Charlie drives at an average speed of 108 miles per hour. Peter drives at an average speed of 99 miles per hour. Peter is given a head start of 12 miles. Charlie and Peter finish at the same time. How far does Charlie drive?

126,132,144 or 156 miles

8th grade math - Ms. Sue please - Ms. Sue, Friday, November 16, 2012 at 10:16pm
I don't know.
8th grade math - drwls, Saturday, November 17, 2012 at 9:00am
Charlie drives 9 mph faster, and it takes him 12/9 = 4/3 hours to catch up. He drives (4/3)*108 = 144 miles in that time

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