zaidzkr9 zaidzkr9

12-10-2021
Mathematics

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Stoplight A changes color every 42 seconds and Stoplight B changes color every 30 seconds. Both stoplights changed color 10 seconds ago. After how many seconds will the stoplights change color at the same time again

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winterannalin winterannalin

12-10-2021

42-30= 12, 12x42=504s until they change at the same time. 504-10= 494s from 10s ago

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