Question

Megan's commute to work includes an 8-mile drive and a 21-mile train ride. This expression can be used to find the total time it takes Megan toget to work, where x is her average driving speed in miles/hour.

Answer 1

Answer: x + 20

0.50 hours

Explanation:

Answer 2

The time is:

`time=\frac{distance}{average\text{ }speed}`

Then, the average speed of the train is represented by x + 20.

If x = 45, then:

`\begin{gathered} time=(8)/(45)+(21)/(45+20) \\ time=0.5\text{ }hour \end{gathered}`

Answer:

1) x + 20

2) 0.5 hour