SOLUTION: If one has already has already driven one mile at 30 mph, how fast must one drive the second mile so that the average speed for the trip equals 60 mph

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: If one has already has already driven one mile at 30 mph, how fast must one drive the second mile so that the average speed for the trip equals 60 mph      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


   



Question 535638: If one has already has already driven one mile at 30 mph, how fast must one drive the second mile so that the average speed for the trip equals 60 mph
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
If one has already has already driven one mile at 30 mph, how fast must one drive the second mile so that the average speed for the trip equals 60 mph
:
this is not possible, the time used for the 1st mile, would be the time required to run 2 mi,
:
The equation for this: time = dist/speed, x = speed required to accomplish this
1%2F30 + 1%2Fx = 2%2F60
multiply by 60x, results
2x + 60 = 2x; obviously, not possible