Answer: " 405 seconds " .
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Explanation:
Note: 6 3/4 min = 6.75 min. ;
Note: 1 min = 60 sec
6.75 min = ? sec ? .
6.75 min * (60 sec / 1 min) = (6.75 * 60) sec = 405 sec.
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The answer is: " 405 seconds " .
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Hope this helps!
Best wishes!
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