Math - 8th grade - Please help

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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

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