Answer
$$40 \mathrm{\ ns} $$
Work Step by Step
For a negative pion
$$\Delta t=\frac{12 \mathrm{m}}{0.993\left|2.998 \times 10^{8} \mathrm{m} / \mathrm{s}\right|}=4.0 \times 10^{-8} \mathrm{s}=40 \mathrm{\ ns} $$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 44 - Quarks, Leptons, and the Big Bang - Problems - Page 1366: 49f
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