Given expression: 
We need to add the given rational expressions.
First step: Combined like terms in the numerator and kept the common denominator.

Second step they applied : Canceling the like term x^2 and got 
Note: We can't cancel like terms in top and bottom like this.
We can cancel out common factors in top an bottom.
<h3>Therefore, Micah did not add the expressions correctly.</h3>
https://youtu.be/GZcm4mswivc
espero que te ayude
You can determine your speed that is Speed = (distance/Time). Mind you in this cast time should be in hour, so 30 min - 1/2 hour or 0.5 Hour
Your speed is 5/0.5 = 10 mi/hour