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Each of A, B, C and D need a umique ti...

Each of A, B, C and D need a umique
time to do a certain work. A can do the work in x days and B can
do the work in 2x days. A started the work and do it for `22 2/9` days
then he is replaced by B and B completed remaining work in same
time as C and D together can complete the whole work.
The ratio of the efficiency of C and D is `4: 5`. If C and D work for
alternative days starting form C then they can do the total work
in `44 1/2` days.

A

`1//7`

B

`1//9`

C

`1//6`

D

`3//7`

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