Question: Assuming that it takes 2 nsec to copy a byte, how much time does it take to completely rewrite the screen of an 80 character

Assuming that it takes 2 nsec to copy a byte, how much time does it take to completely rewrite the screen of an 80 character × 25 line text mode memory-mapped screen? What about a 1024 × 768 pixel graphics screen with 24-bit color?

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