[单选]一项工程,如果小王先单独干6天后,小刘接着单独干9天可完成总任务量的;如果小王单独干9天后,小刘接着单独干6天可完成总任务量的。则小王和小刘一起完成这项工作需要多少天()
A.15
B.20
C.24
D.28

相关专题: 总任务  

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