# Homework Help: Calculating speed, when given total time it took, and the radius

1. Jun 12, 2014

### _emmakala

1. A bug walking on a circular flowerpot completes one lap around the plantar in 12.86s.
If the radius is of the plantar is 11 cm, how fast was it traveling? Answer in cm/s.

2. Relevant equations

3. The attempt at a solution
I tried dividing the diameter of the plantar by the speed & the speed by diameter. I tried the radius by the speed and vice-versa.

I appreciate any help anyone can give me! Thanks. :)

2. Jun 12, 2014

### Nathanael

If he's walking on a circular flowerpot and completes "one lap" then presumably he's walking around the circumference of the pot, right?

So what is the distance that he traveled?

3. Jun 12, 2014

### _emmakala

Thank you so much! So he traveled 69.1150 and then I would divide that by the total time it took which was 12.86 to get his speed which was 5.3744! Thank you so much!

4. Jun 12, 2014

### Nathanael

No problem.

But be careful! What are the units of his speed? (It's a very good habit to pay attention to units.)

Edit:
Nevermind, I just realized the OP says "answer in cm/s"

But still, it's good to notice units :)