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LCM problem solving

Ed and Gary joined a fun run. Gary would stop and drink 1 cup of water every 15 minutes, while Ed would stop and drink 1 cup of water every 20 minutes. Gary started the fun run at 5:00 am and both ended at 8:00 am What time did Ed start, if at 8:00 am, they drank the same number of cups of water?​