Neil Armstrong was the first man to walk on the moon. On July 20, 1969, his famous statement, "That's one small step for man, one giant leap for mankind," was received at 10:56 p.m. (EDT) on Earth. (a) How long did it take his voice to reach Earth via radio waves? (b) at what time (in EDT) did he utter this statement at the surface of the moon? The distance between the Earth and the moon is 3.85 × 108 m.

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