SOLUTION: Justin can run 10 km in the same time that enzo can run in 12 km. If enzo can run 1 kph faster than justin, how fast can enzo run?

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Justin can run 10 km in the same time that enzo can run in 12 km. If enzo can run 1 kph faster than justin, how fast can enzo run?      Log On


   

Question 1090667: Justin can run 10 km in the same time that enzo can run in 12 km. If enzo can run 1 kph faster than justin, how fast can enzo run?
Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.
Let x be the Enzo's rate, in km/h.

Then the Justin's rate is (x-1) km/h.


The "time" equation is

10%2F%28x-1%29 = 12%2Fx.


Solve it for x to get the answer.

I can solve it mentally.

Answer. Enzo's rate is 6 km/h.


Solved.