A. In early versions of GarageBand, no, it only supported a single tempo per song.
The only workaround would be to create a separate song in each tempo, and use both exported AIFFs. IOW, and this is not pretty, you create song1 at 140BPM. Then you create song2 at 120BPM. You export both and import them (via drag and drop) into a third project and piece them together.
though FAR less pretty, you could export each track of each song, and then import all the tracks into a third song. (brrrrrr, not fun)
The best option would be to get the latest version of GarageBand, GarageBand '08 (and later), which does offer Tempo Changes during a song, as many as desired, via the Master Track's Tempo Curve (for more information on this and other automation, search GarageBand's Help for "Curve")
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GarageBand from Apple Computer uses audio loops and MIDI loops in Apple Loops format. It can work with Audio Units plug-ins. Apple Macintosh Compatible FireWire and USB interfaces can be used to connect Audio and MIDI instruments to your Mac, and be recorded into GarageBand.
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