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A ,\ B ,\ C and D completed colouring a ...

`A ,\ B ,\ C` and `D` completed colouring a picture in `3/4` hour, `7/(12)` hour, `5/8` hour and `6/7` hour respectively. Which of the following took the least time in colouring the picture? `A` (b) `B` (c) `C` (d) `D`

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