SOLUTION: If a car is going 30mph uphill within a mile, how fast does the car have to drive downhill to have an average rate of 60pmh?

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Question 789695: If a car is going 30mph uphill within a mile, how fast does the car have to drive downhill to have an average rate of 60pmh?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
If a car is going 30mph uphill within a mile, how fast does the car have to drive downhill to have an average rate of 60pmh?
:
Impossible, he can't drive fast enough
:
Prove this, write a time equation
Time up + time down = time at 60 mph
1%2F30 + 1%2Fx = 2%2F60
:
2%2F60 + 1%2Fx = 2%2F60;
:
No matter how fast for x, it would not be an equation