SOLUTION: Please help me. I've worked on it for a week! If a car averages 40 mph for the first 1/2 mile, how fast must the car go the 2nd half mile to average 60 mph for the whole mile???

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Question 38840: Please help me. I've worked on it for a week! If a car averages 40 mph for the first 1/2 mile, how fast must the car go the 2nd half mile to average 60 mph for the whole mile??? Thanks
Found 2 solutions by Nate, checkley71:
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
%28%2840%2Bx%29%2F2%29=60
%2840%2Bx%29=120
x=80
The car would have to average 80mph.

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
40*.5+X*.5=60 OR 20+.5X=60 OR .5X=40 OR X=40/.5 OR X=80
40*.5+80*.5=60 OR 20+40=60 OR 60=60