Homework Help: Math - 8th grade - Please help

Posted by Chris on Friday, November 16, 2012 at 10:39pm.

I don't know the formula to figure this out.

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

Math - 8th grade - Please help - Steve, Saturday, November 17, 2012 at 12:31am
Peter drives 12 miles less than Charlie.
they both drive the same time
so, if Charlie drives c miles,
and since time = distance/speed,

c/108 = (c-12)/99
99c = 108(c-12)
9c = 1296
c = 144 miles

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