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Answer:
The answer is "16 hours"
Explanation:
The 3 workers were paid an extra fee.
[tex]\frac{\$4}{hour} \\\\3 \times 4= 12 \ productivity \\\\[/tex]
Their output rate will be sustained after the [tex]4^{th}[/tex]hour,
[tex]= 12 + 4 \\\\= 16 \ hours[/tex]