SOLUTION: It took Andrea 2.7 hours to drive to her​ mother's house on Wednesday morning. On her return trip on Thursday night, traffic was heavier, so the trip took her 3 hours. Her a
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Question 1070249: It took Andrea 2.7 hours to drive to her mother's house on Wednesday morning. On her return trip on Thursday night, traffic was heavier, so the trip took her 3 hours. Her average speed on Thursday was 7 mph slower than on Wednesday. What was her average speed on Thursday?
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Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
It took Andrea 2.7 hours to drive to her mother's house on Wednesday morning. On her return trip on Thursday night, traffic was heavier, so the trip took her 3 hours. Her average speed on Thursday was 7 mph slower than on Wednesday. What was her average speed on Thursday?
--------
r = speed going
d = 2.7r
---
d = 3*(r-7)
Solve for r
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