The lifetime of a p-meson (unstable elementary particle

The lifetime of a p-meson (unstable elementary particle) in the frame of reference, relative to which it is motionless, is 2.5 * 10^-8 s. Find the distance traveled by p-mesons from the source to decay in the laboratory coordinate system, if their velocity is v/c=0.64.
10489. A detailed solution with a brief note of the conditions, formulas and laws used in the solution, the derivation of the calculation formula and the answer.
If you have any questions about the solution, write. I try to help.