Question 7
Teams A and B each have 10 workers. Working alone, A builds a road in 14 days and a bridge in 25 days; B builds the same road in 18 days and the same bridge in 15 days. Team C consists of 5 workers from A and 5 from B. It finishes the road and then builds the bridge. How many days does C need in total? Show your reasoning.
Practice clarification: for each job, workers within each original team have equal, constant productivity, and their work rates add. Workers from different teams need not have equal productivity.
Practice clarification: for each job, workers within each original team have equal, constant productivity, and their work rates add. Workers from different teams need not have equal productivity.