if a work is done by a and b in 2 days, b and c in 4 days and c and a in 4/5 days , then in how many days , then how many days the

if a work is done by a and b in 2 days, b and c in 4 days and c and a in 4/5 days , then in how many days , then how many days the three complete the work together?
a..1 day
b..2 days
c..3 days
d..4 days​

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