Factory $$A$$ can assemble $$20$$ televisions per hour and Factory $$B$$ can assemble $$30$$ televisions per hour. With these constant rates, if $$A$$ assembles $$300$$ televisions in a period, how many televisions can $$B$$ assemble within the same period? 
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Time: $$300\div20=15$$ hours.  So, Factory $$B$$ can assemble $$15\times30=450$$ televisions. 