How to make clips play faster/slower?

Hi, I recorded a road while driving on it. I want to use it for the beginning of a video but I don't want it to play at real-time speed. I want it to move faster than real time. How can I make this happen on imovie? how do I compress the clip (about 10 minutes) into something more like 5 minutes? I don't want to cut the clip, I want to play the whole thing but I want it to just move faster. It would also be cool because this way I could also learn to make things go in slow motion.

How can I make this happen on imovie?
If you want to do this from within iMovie, use the previous version. Basically, playback speed can be modified by adding your video to an audio clip having a duration or selected segment duration for which you want the video to play and scaling it to the duration of the audio using the QT Pro "Add to Selection & Scale" Edit menu option. You can also reset the playback using the fee JES Deinterlacer utility. (Search the forum for URL to Karsten Schlüter's site area where he has documented many common "Tips and Tricks" for use with iMovie '08.)

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