When the World Wide Web first became popular in the 1990s, download speeds reached a maximum of about 56 kilobits per second. Approximately how many minutes would the download of a 4.2-megabyte song have taken at that speed? (Note that there are 8000 kilobits in a megabyte.)
A. 0.6
B. 10
C. 1800
D. 7200
E. 36000

Distance = speed × time中文
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B. 10

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