The positive muon (+), an unstable particle, lives on average 2.20 x 10-6 s (measured in its own frame of reference) before decaying. (a) If

The positive muon (µ+), an unstable particle, lives on average 2.20 x 10-6 s (measured in its own frame of reference) before decaying.
(a) If such a particle is moving, with respect to the laboratory, with a speed of 0.900c, what average lifetime is measured in the laboratory?
(b) What average distance, measured in the laboratory, does the particle move before decaying?