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Ais twice as efficient as B.B started the work and after 4 days A joins B and the total work was complete in 9 days then B can complete whole work alone in : |
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Answer» 9.5 days work, then A taken `x` days to complete that work. Now, B worked for 9 days and A for `(9 -4)= 5` days S0,`1/xx 5 + 1/(2x) xx 9 = 1` `2x = 19` So, B is 19 days |
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