Mathematics, 15.06.2020 23:57, nkidder

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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It took Debbie 3.6 hours to drive to her mother's house on Thursday morning. On her return trip on F...