SOLUTION: another problem.. If a bus traveled 10 km/h faster, it would take 2h less time to make a 315km trip. What is its speed? Thanks!

Question 106158: another problem..
If a bus traveled 10 km/h faster, it would take 2h less time to make a 315km trip. What is its speed?
Thanks!
Answer by HyperBrain(694) (Show Source): You can put this solution on YOUR website!
Let x=the original speed
____x+10=the increased speed

If a bus traveled 10 km/h faster, it would take 2h less time to make a 315km trip
time for the car traveling with its orig. speed=
time for the car with faster speed =

This means that:

Using the quadratic formula,

The discriminant is negative------the roots are unequal and imaginary(see my lesson,"Don't discriminate the DISCRIMINANT!!!!!" and,
therefore, there is no solution!

Power up,
HyperBrain!
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