On average, a muon lives for $2.2{\times 10^{-6}}$ seconds before it disintegrates into other particles. If you're observing such a muon moving in a straight line with speed $v = .8c$, how far will you observe the muon to travel before it "dies"? (Use the approximation $c = 3 {\times 10^8}$ meters/second.)

If you're observing a muon traveling at constant speed in a straight line and find that it traveled 1,000 meters before disintegrating, how fast was it moving? (Use the approximation $c = 3{\times 10^8}$ meters/second.)