How long would you normally expect brake pads and tyres to last? I've worn my front pads to the metal (oops) in less than 1500 miles, and the rear tyre (ultra gatorskin) isn't looking too happy either. Probably just because I'm a fat git doing mostly town miles.
Rear tyres tend to wear faster than the front, if there is still some life in it then you could just swap them over.