SOLUTION: Nancy took a 3 hour drive. She went 45 miles before she got caught in a storm. Then she drove 60 miles at 8 mph less than she had driven when the weather was good. What was her spe

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Question 1114407: Nancy took a 3 hour drive. She went 45 miles before she got caught in a storm. Then she drove 60 miles at 8 mph less than she had driven when the weather was good. What was her speed, in miles per hour, driving in the storm?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
RT=D Constant Travel Rate for Distance

r, speed, miles per hour, while in the storm 
             SPEED      TIME          DISTANCE

NO STORM        r+8     45/(r+8)        45

IN STORM        r        60/r           60

Total                   3

Continue with the equation summing the two time quantities,
45%2F%28r%2B8%29%2B60%2Fr=3
-
15%2F%28r%2B8%29%2B20%2Fr=1
.
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