A and B can complete a job in 80 days and 120 days respectively.they worked on it alternate days.how many days would they take to complete it..//

• 1 day work of A = 1/80
  1 day work of B = 1/120
  When A and B work alternately once(i.e for 2 days) the amount of work completed is 1/80+1/120= 200/(80.120)= 1/48 of the work. So they can complete the work by working for 48 more ALTERNATE slots aka 48*2= 96 days.
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