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?

Result

x =  252 s

Solution:

36=2233 42=237  LCM(36,42)=25236 = 2 \cdot 2 \cdot 3 \cdot 3 \ \\ 42 = 2 \cdot 3 \cdot 7 \ \\ \ \\ \text{LCM}(36, 42) = 252



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