Respuesta :

Plus16463574585

Answer:

[tex]t=20\:sec[/tex]

Explanation:

[tex]1 \:Watt\:=\:\frac{1\:Joule}{sec}\\\\sec\:=\:\frac{No.\:of\:Joules}{No.\:of\:Watts}\\\\t=\frac{600}{30}\\\\t=20\:sec[/tex]

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