A and B together can complete a particular task in 4 days. If A alone can complete the same task in 12 days, how many days will B take to complete the task if he works alone ?
Let the speed of A and B be x and y respectively to complete W work.
x+y = (W/4)
Now, x = (W/12)
Therefore, y = W/6
Hence, y can complete piece of work in 6 days.
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