- #1

#### jk4

## Homework Statement

How long does it take an automobile traveling 60.0 km/h to become even with a car that is traveling in another lane at 40.0 km/h if the cars' front bumpers are initially 125 m apart?

## Homework Equations

[tex]v_{average} = \frac{\Delta x}{\Delta t}[/tex]

## The Attempt at a Solution

I'll just give an explanation because it seems like a pretty simple problem. I'm just getting a different answer than the book. Here goes:

I set the distance for the 60km/h car to d+125m since it has to travel the same distance as the 40km/h car plus the extra 125m that it had to catch up. Then I solved them for the variable (d) and set the 2 equations equal to each other, and then finished solving for time.

I ended up with:

**6.25 seconds**The book says it takes:

*22.5 seconds*

the books answer seems wrong to me... can anyone verify this, or let me know what I did wrong? Thank you.