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1, 2, 3, 4, 6, 8, 9, 12 18, 24, 36, and 72 are.
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Average speed during a period of time =(distance traveled during the time) divided by (length of the time period)
72
8x9=72
72 + 72 = 144
LCM of 9 and 8 and 3 is 72.