Explain how an interlocking schedule at a puerto rican school works why are interlocking schedules used

Well in interlocked schedule is just where the schedules overlap each other, and they are used because Puerto rico and other Hispanic countries have 2 different choices on what times students can go to school so they needed a way to have both schedules without over crowding the school.
Hope this helps! :) 

Your answer would be d. costa rica.

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