A can do as much work as B and C together can do. A and B can together do a piece of work in 9 hours 36 minutes and C can do it in 48 hours. The time that B needs to do the work alone, is :
[A] 12 hours
[B] 18 hours
[C] 24 hours
[D] 30 hours

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This question is part of UPSC Prelims Practice and Mock Tests membership programme.