SOLUTION: It took Cathy 1.81 hours to drive to her​ mother's house on Sunday morning. On her return trip on Monday ​night, traffic was​ heavier, so the trip took her 2hours

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Question 1107681: It took Cathy 1.81 hours to drive to her​ mother's house on Sunday morning. On her return trip on Monday ​night, traffic was​ heavier, so the trip took her 2hours. Her average speed on Monday was 5mph slower than on Sunday.What was her average speed
Answer by josgarithmetic(39614) About Me  (Show Source):
You can put this solution on YOUR website!
                  SPEED       TIME      DISTANCE

SUNDAY            r            1.81     1.81r=d
MONDAY            r-5            2      2(r-5)=d

1.81r=2r-10
0.19r=10
r=10%2F0.19
r=52.6----------just the Sunday trip speed.

What was the actual distance?
d=1.81%2A%2810%2F0.19%29
d=95.3-----miles, each way.

AVERAGE SPEED, TWO-WAY TRIP
2d%2F%281.81%2B2%29
and you can substitute and evaluate the expression.