From the given problem, there are only two parameters that are known: speed and time. From these two, I deduced that the obvious parameter relating them is the distance. Hence, I am guessing that what is asked here is the total distance a certain elementary particle has traveled in its lifetime. This can be determined by merely multiplying the speed with the lifetime of years.
Total distance = (2.75×10⁸ m/s)*(3.86×10⁻⁶ s)
Total distance = 1.0615×10¹⁵ meters
