MSTC Refresher 2: Motion Problem 

2. Two old-timers started walking at sunrise at a constant speed. One went from Newport Beach to Inglewood and the other from Inglewood to Newport Beach on the same road. They met a noon and, continuing with no stop, arrived respectively at Inglewood at 4 PM and at Newport Beach at 9PM. At what time was the sunrise that day?
A. 5:00 AM C. 5:40 AM
B. 5:20 AM D. 6:00 AM
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