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Somalin
Three persons A ,B ,C run along a circular path with speeds of $6$ kmph, $4$ kmph, $8$ kmph respectively. If they start their race from the same point and at the same time and the length of circular path is $24$ km, then after what time will they meet again?
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Javed Khan
Ans: $12$ hour

Required time
$=\text{LCM}\left(\dfrac{24}{6-4},\dfrac{24}{8-4}\right)\\ =\text{LCM}(12,6)\\ =12$

(see similar question for detailed explanation)
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