Einsteins special theory of relativity states that time is

Chapter 1, Problem 100

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Einsteins special theory of relativity states that time is relative: Time speeds up or slows down, depending on how fast one object is moving with respect to another. For example, a space probe traveling at a velocity vnear the speed of light cwill have clocked a time thours, but for a stationary observer on Earth that corresponds to a time t0. The formula governing this relativity is given by Physics: Special Theory of Relativity. If the time elapsed on a space probe mission is 5 years but the time elapsed on Earth during that mission is 30 years, how fast is the space probe traveling? Give your answer relative to the speed of light.