Question
Write all the factors of $12$
✓
Answer
$\therefore L.C.M. $ of $63, 70$ and $77 = 2 \times 3 \times 3 \times 5 \times 7 \times 11$
$= 6930$
Hence, the minimum distance each should cover so that all cover the distance in complete steps is $6930\ cm.$
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