Buses 4

intervals:
1st bus 40 min.
2nd bus 2h
3rd bud 20min

How long take them to meet - as soon as possible?

Correct answer:

h =  4 h

Step-by-step explanation:

$$\begin{gathered} 40=2^3\cdot 5 \\ 120=2^3\cdot 3\cdot 5 \\ 80=2^4\cdot 5 \\ LCM(40,120,80)=2^4\cdot 3\cdot 5=240 \\ h=240\mathrm{/}60=4\text{ h} \end{gathered}$$

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