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**Weekend Assignment sheet -- question**

## Homework Statement

An observer is located at a unknown distance away from a cannon. A cannonball is fired from the cannon at 425 m/s. If the cannonball goes past the observer 0.20s before the sound is heard, how far away is the cannon from the observer.

## Homework Equations

speed= distance * time ???

## The Attempt at a Solution

I don't even know where to begin on this one. I can SEE that SOMEHOW you are comparing the two speeds to tell how far the SOUND went while the cannonball was travelling, but I don't have a very clear idea of how to answer this one in my head. I don't necessarily want the answer to this as much as I do the way to go about finding it. Thanks!!!