Audio speed from iPhone video

I have a problem with importing video footage shot on my iPhone 4s. The video plays at the correct speed, but the audio has been sped up. Funny though it is to hear people talking ike Alvin and the Chipmunks, I'd like to be able to use the footage. Any thoughts?
The audio plays fine when I play it back on my iPhone so the problem is definitely with iMovie 11.
Thanks

Fixed! Although not using the advice above... I re-imported them to iMovie a third time and they now seem to be ok. I have no idea what was causing the first and second imports to go awry. The only difference was that when I imported them for a third time the project was empty. My guess is that by having a project already partially done, iMovie was trying to force a change in the frame rate on import.
The tip on Quicktime will still be useful though as I'm considering a change in workflow, and potentially different software (Premiere Elements) after all of the problems that I've had with this.
Thanks for your help with this - appreciate the time that you took.

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http://support.apple.com/kb/TS4215
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Completely random fix that worked for me - was driving me nuts and like you tried every other suggestion.
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Audio speed from iPhone video

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