Question 1107679: 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 22hours. Her average speed on Monday was 55mph slower than on Sunday.What was her average speed
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! 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 22 hours.
Her average speed on Monday was 55mph slower than on Sunday.
What was her average speed
:
let s = her average speed on Monday
then
(s+55) = her speed on Sunday
:
Write a distance equation, dist = speed * time, dist is the same both ways
22s = 1.81(s+55)
22s = 1.81s + 99.55
22s - 1.81s = 99.55
20.19s = 99.55
s = 99.55/20.19
s = 4.93 mph her speed average speed on Monday
:
;
Check this, find the distance each way (should be equal)
4.93(22) = 108.46 km
59.93(1.81) = 108.47 km
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