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80 character/line , 8 bits/character so total we have 80*8 bits=640 bits
these are swappd in horizontal means we have to access in 100 micro sec,so

100 microsec---------------------640 bits 
100*10-6---------------------------640 bits
1 sec---------------------------(640)/(100*10-6)
                                                =6.4mbps (rate)

 

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