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Q.2 Three boys.step off together from the same spot. Their steps measure 63 cm, 70 cm and 77 cm respectively. What is the minimum distance each should cover so that all can cover the distance in complete steps?
Answer :

The minimum distance that each boy should walk must be the least common multiple (LCM) of the measure of their steps.
$$ \begin{array}{|l} \llap{7~~~~} 63, 70, 77 \\ \hline 9, 10, 11 \end{array} $$ LCM = 7×9 ×10× 11 = 6930 cm
Hence the minimum distance is 6930 cm .