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15 May, 06:07

It took Brian 6 hours to drive to the sales conference. He took the same route on the way back home, but

thus time the trip took 7 hours. If Brian drove 9 mph faster on his way to the conference, how fast did he

drive on the way back home?

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Answers (1)
  1. 15 May, 06:23
    0
    Answer: 54 mph

    Step-by-step explanation:

    d-the distance

    s+9 - the speed to the conference

    d=6 * (s+9)

    s - is the speed on the way back home

    d=7*s

    so 6 * (s+9) = 7*s

    6s+54=7s

    -6s - 6s

    54 = 7s-6s

    s=54 mph
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