Your question is Schedule Tasks on Cores. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Given several processors with four available cores each, their availability times, and task durations where exactly four tasks are assigned to each processor, assign every job to a processor core to return the earliest possible completion time for all work.