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28 March, 11:11

It took Debbie 3.6 hours to drive to her mother's house on Thursday morning. On her return trip on Friday night, traffic was heavier, so it took her 4 hours. Her average speed on Friday was 4 mi/hr slower than on Thursday. What was her speed on Friday?

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Answers (1)
  1. 28 March, 11:56
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    36 mph

    Step-by-step explanation:

    d = rt

    d = (x) (3.6)

    d = (x-4) (4)

    3.6x = 4x - 16

    -0.4x = - 16

    x = 40

    Her speed was 40 on Thursday, so 36 on Friday
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