A muon formed high in the Earths atmosphere travels at speed v = 0.990c for a distance

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A muon formed high in the Earth’s atmosphere travels at speed v = 0.990c for a distance of 4.60 km before it decays into an electron, a neutrino, and an antineutrino (μ− → e− + v + v).
(a) How long does the muon live, as measured in its reference frame?
(b) How far does the earth travel, as measured in the frame of the muon?
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