6th Grade Working/Engineering Problems: Problem 4

Problem: There two identical warehouses whose contents need to be moved. Truck A needs 6 hours to finish moving everything from one warehouse; Truck B needs 7 hours to move everything from one warehouse; Truck C needs 14 hours to move everything from one warehouse. Trucks A and B each start moving one warehouse, while Truck C first helps Truck A and then helps Truck B. The two warehouses get completed at the same time. Truck C helped Truck A for _____ hours and helped Truck B for ______ hours.

Key: Find the TOTAL result, TOTAL efficiency, TOTAL time

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