Buses 4

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

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

Correct result:

h =  4 h

Solution:

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

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