A+traffic+light+at+a+crossing+changes+after+every+30+seconds.At+a+certain+time,both+the+lights+change+together.After+how+many+seconds+of+their+changing+simultaneously+will+they+change+again+it+one+time.
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a traffic light at a crossing changes after every 30 seconds at a certain time both the lights change toget it not her aft how many seconds of their changing simulta neously will they change again it one time
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