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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 :
A. 9.5 days
B. 10 days
C. 19 days
D. 38 days

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Best answer
Correct Answer - (c)
A twice ecficient, so if B taken `2x`days to complete a
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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