Calculating Collision: How Long Until Two Continents Collide?

[CrossFit415]

Homework Statement

Typical motions of one plate relative to another are 1 centimeter per year. At this rate, how long would it take for two continents 3,000 km apart to collide?

Which formula would I use? Thanks

Homework Equations

The Attempt at a Solution

I know that 1 km = 100,000 cm

 

[Mr.A.Gibson]

time = distance / speed

 

[CrossFit415]

t = 3,000 km / speed ?

 

[CrossFit415]

Well I got 3 x 10 to the 8th. Not sure if I got this right...

 

[Mr.A.Gibson]

Well I got 3 x 10 to the 8th. Not sure if I got this right...

correct that figure in years.