give right answer with reason only because it is previously posted question .....
.............A take 12 hrs to make publication B take 10 hrs to make publication. find the time taken by them to make two publications working independently?
answer-----

• for A it takes 10hr for one publication
  for B it takes 12hr for one publication
  here they said that both A and B working independently for 2 publications
  A and B starts at same time so A finish in 10hr and B finish add 2hr after A finished
  so the total time require both of them to make two publications is 12 hr
  
• 12 years agoHelpfull: Yes(8) No(3)
• 12 hours because by 12 hours a completes 1 publication and a completes 1 publication.
  So by 12 hours 2 publications are completed.
• 12 years agoHelpfull: Yes(4) No(0)