Let x be the time it take them to clean the room together:
Working together Equation:
1 1
---- (x) + ----- (x) = 1
4 3
LCD: 12
Multiply each term by 12:
(12) [ x/4 + x/3 = 1 ] (12)
3x + 4x = 12
7x/7 =12/7
x = 1 ⁵/₇ hours
ANSWER: It will take 1 ⁵ /₇ hours for Jun and Ana working together to clean the same room.
Please note that when more people work on the same work/job, the faster it will be completed.