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=23⋅5 120=23⋅3⋅5 80=24⋅5 LCM(40,120,80)=24⋅3⋅5=240  h=240/60=4 h

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