Refer to Example 26.2. One million muons are moving toward the ground at speed 0.9950c from an

Question:

Refer to Example 26.2. One million muons are moving toward the ground at speed 0.9950c from an altitude of 4500 m. In the frame of reference of an observer on the ground, what are?
(a) The distance traveled by the muons;
(b) The time of flight of the muons;
(c) The time interval during which half of the muons decay;
(d) The number of muons that survive to reach sea level.