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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?

Respuesta :

rococo908

Answer:

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

epickitten95

Answer:

36

Step-by-step explanation:

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