word problem solving, Mathematics

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the traffic light at three different road crossing change after every 48 seconds, 72 seconds and 108 seconds respectively. if they change simultaneously at 7 a.m., at what time will they change simultaneously again

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f all the permutations of the letters of the word chalk are written in a dictionary the rank of this word will be?

Simplification, if a+1/b=b+1/c=c+1/a then the value of abc is

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