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A ,\ B\ a n d\ C can reap a field in 15 ...

`A ,\ B\ a n d\ C` can reap a field in `15 3/4` days : `B ,\ C\ a n d\ D` in 14 days: `C ,\ D\ a n d\ A` in 18 days: `D ,\ A\ a n d\ B` in 21 days. In what time can `A ,\ B ,\ C\ a n d\ D` together reap it?

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RD SHARMA ENGLISH-TIME AND WORK-All Questions
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  3. A ,\ B\ a n d\ C can reap a field in 15 3/4 days : B ,\ C\ a n d\ D in...

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