It has been found that galaxies are moving away from the earth

It has been found that galaxies are moving away from the earth

It has been found that galaxies are moving away from the earth at a speed that is proportional to their distance from the earth. This discovery is known as Hubble’s law. The speed of a galaxy at distance from the earth is given by v = Hr, where H is the Hubble constant, equal to 1.58 A? 10-18 s-1. What is the speed of a galaxy?
(a) 5 A? 1022 m from earth and
(b) 2 A? 1025 m from earth?
(c) If each of these galaxies has traveled with constant speed, how long ago were they both located at the same place as the earth?

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