A and B together can dig a trench in 12 days, which A alone can dig in 28 days; B alone can dig it in

A and B together can dig a trench in 12 days, which A alone can dig in

1.	A and B together can dig a trench in 12 days, which A alone can dig in 28 days; B alone can dig it in
A.	20 days
B.	21 days
C.	22 days
D.	23 days
Answer» C. 22 days

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A and B together can dig a trench in 12 days, which A alone can dig in 28 days; B alone can dig it in

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