A and b working together can finish a piece of work in 4 days while a alone can do it in 6 days. Then the number of days that b can take to complete the work is
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(A+B)'s 1 day's work = 1÷4
A's 1 day's work= 1÷6
B's 1 day's work = 1÷4-1÷6= 1÷12
Therefore , B can finish the work in 12 days
A's 1 day's work= 1÷6
B's 1 day's work = 1÷4-1÷6= 1÷12
Therefore , B can finish the work in 12 days
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