How Long to Overtake at Different Speeds?

[meredith]

Homework Statement

how long does it take a car traveling in the left lane at 60 km/h to overtake another car traveling in the right lane at 40 kn/h when the cars front bumpers are initially 100 m apart?

Homework Equations

relative velocity equations
V ab = v ae + V be

The Attempt at a Solution

i don't really know my work doesn't make sense and there's no sense typing it all in here cause its wrong and i can't even get al the symbols

 

[Rake-MC]

Relative to the 40km/h car, the car in the left lane is traveling 20km/h.

So now you have relative velocity, they give you relative distance (100m) solve for time.

Hint:

Spoiler

velocity = distance / time

Hint #2:

Spoiler

Don't forget to convert relative velocity to m/s if you want it in si units.