A and B can build a wall in 12 and 8 days.A started building the wall and after he had been working for 4 days.he was joined by B.how much total time was taken to build the wall
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A's workin 1 day = 1/12
B. ... 1 day = 1/8
A+B.....1/12+1/8=2/24+3/24
= 5/24
A's work for 4 days = 1/12x4
= 4/12 = 1/3
Remain=2/3
2/3 part by A and B
2/3x24/5=5/36
36/5=7 1/5 days
Total time=4+7 1/5=11 1/5 days
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