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1. |
Q: 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 | |