Posted by Chris on .
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 -
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