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They clean the room for 7 hours
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Jun can clean a room in 4hrs
       in 1hr he can clean 1/4 part of a room
Ana can clean the same room in 3hrs
       in  1 hr she can clean  1/3 part of a room
working together in 1 hr, they can clean  1/4 +1/3 = 7/12
part of a room
therefore time taken to clean the whole room = 12/7
   1 5/12 hrs

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