K, L and M can do a piece of work in 20, 30 and 60 days respectively. In how many days can K do the total work if he is assisted by L and M on every third day ?

K, L and M can do a piece of work in 20, 30 and 60 days respectively.

1.	K, L and M can do a piece of work in 20, 30 and 60 days respectively. In how many days can K do the total work if he is assisted by L and M on every third day ?
A.	15 days
B.	13 days
C.	12 days
D.	10 days
Answer» B. 13 days

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K, L and M can do a piece of work in 20, 30 and 60 days respectively. In how many days can K do the total work if he is assisted by L and M on every third day ?

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