Question
Is $23$ a prime number or not$?$
✓
Answer
| $2$ | $63, 70, 77$ |
| $3$ | $63, 35, 77$ |
| $3$ | $21, 35, 77$ |
| $5$ | $7, 35, 77$ |
| $7$ | $7, 7, 77$ |
| $11$ | $1, 1, 1, 1$ |
| $1, 1, 1$ |
$\therefore L.C.M.$ 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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