Tram stop

At the tram stop met tram No. 4 and no. 5 at 10 AM. Tram no. 4 runs every 5 minutes, tram No. 5 at an interval of 7 minutes. How many times will meet until 12 o'clock?

Correct result:

n =  3

Solution:

$$\begin{gathered} 5=5 \\ 7=7 \\ \text{LCM}(5,7)=35 \\ 12-10=2h=120min \\ n=120\mathrm{/}35=3.42\doteq 3 \end{gathered}$$

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