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8th grade math - Ms. Sue please

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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 -

    I don't know.

  • 8th grade math -

    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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