A and b can complete a work alone in ,18 days and 24 days respectively.if b started work alone and after 3 days a also joined then in how many days whole world will be completed.
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Let A work for x days
In x days , work by A = x/18 work
Time given by B = x + 3 days
In x +3 days, work by B = x+3/24 work
x/18 + x+3/24= 1
7x + 9/72 = 1
7x + 9 = 72
]7x = 72 - 9 = 63
x = 63/7 = 9 days
Time taken to complete work = 9 + 3 = 12 days
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