One train, at 12:00, departed from area A to area B at a speed of 60 km/h. The other train departed from area B towards area A at a speed of 40 km/h 2 hours later. The distance between areas A and B is 420 km. At what time did the trains meet?
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the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product
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