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In a morning walk, three persons step off together. Their steps Measure 80 cm, 85 cm and 90 cm respectively. What is the minimum distance each should

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In a morning walk, three persons step off together. Their steps Measure 80 cm, 85 cm and 90 cm respectively. What is the minimum distance each should walk so that all can cover the same distance in complete steps?
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here we have to find the HCF of `850 & 680`
`825= 2*5*5*17*1`
`680=2*2*2*5*17*1`
common factors are`2, 5,17`
`:. HCF= 2*5*17= 170`
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