in a walking competition three boys step off together. their step measure 80 CM, 85 cm and 90 cm respectively. at what distance from the starting point will they again step off together?
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Answer:
They will again meet at the lowest common multiple of 80, 85 and 90 cm
80 = 2*2*2*2*5
85 = 5*17
90 = 2*3*3*5
So, LCM of 80,85 and 90 will be
= 2*2*2*2*3*3*5*17
=16*9*5*17
=12,240
So, they all three will meet after 12,240 m
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