There are 8 x 60 = 480 seconds in eight minutes. Therefore, the dog travelled at 9000/480 = 18.75 feet per second.
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Minutes is the unit of time whereas feet is the unit of length. So, there is no relation between these two.
Divide 54 words by 3 minutes to obtain this unit rate, 18 words per minute.
~5.29 per minute.
15.3 per minute
36 feet per second!