Runners circle

Pepa circles the track in 36 seconds. Kamil in 42 seconds. They started together. How many seconds will meet again at the start?

Correct result:

x =  252 s

Solution:

$$\begin{gathered} 36=2\cdot 2\cdot 3\cdot 3 \\ 42=2\cdot 3\cdot 7 \\ \text{LCM}(36,42)=252 \end{gathered}$$

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