$$A$$ can do a job in $$15$$ days while $$B$$ can do it in $$10$$ days. They work on it together for $$3$$ days and then $$A$$ has to take off to deal with a family emergency. In how many days can $$B$$ finish the remaining job? 
Overseas Competition->Knowledge Point->Word Problem Modules->Work Word Problems->Collaborative Work Word Problems