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let radius of circle = r
speeds of A,B,C be a,b,c
then time=dist/vel relative
Tac=2*pi*r/[a+c]...1
Tbc=2*pi*r/[c+b]...2
Tab=2*pi*r/[a-b] {Becoz A and B travel in same dir}
Using 1 and 2
a-b=2*pi*r/440
hence A and B meet in 440sec
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