Alen and Border can do a work individually in 21 and 42 days respectively. In how many days they can complete the work, working alternatively?

Alen and Border can do a work individually in 21 and 42 days respectiv

1.	Alen and Border can do a work individually in 21 and 42 days respectively. In how many days they can complete the work, working alternatively?
A.	14
B.	28
C.	42
D.	35
Answer» C. 42

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Alen and Border can do a work individually in 21 and 42 days respectively. In how many days they can complete the work, working alternatively?

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