Suppose that Hubble's constant were 20 kilometers per second per million light-years. How fast would we expect a galaxy 100 million light-years away to be moving

Away from us at 22,000 km/s

Explanation:

When we take the Hubble constant at the 20 km per second per million light-years. We can expect to go fast at a speed of 22,000 km per second speed and expect to reach about 100 million light-years away from the present position.