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math

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a round trip car ride took 12 hours. the first half of the trip took 7 hours at a rate of 4 miles per hour. what was the average rate of speed on the return trip?

how do i write this as an equation?

  • math -

    distance = rate * time

    The distance for both directions are equal.

    rate1 * time1 = rate2 * time2

  • math -

    I think its 63 miles per hour.
    How i got it:
    12 hrs. minus 7 hrs. = 5hrs for the return trip.
    45*7= r*5
    315==r*5
    315/5 = 63 miles per hour
    (i think that 63 is the answer. im not sure)

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