Jai and Anna are assigned to work together on a project. Jai can complete the entire project alone in 3 hours, while Anna can take 5 hours to complete the project alone. If Jai and Anna work together at their individual speeds, then how quickly can they complete the project?

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Jai and Anna are assigned to work together on a project. Jai can complete the entire project alone in 3 hours, while Anna can take 5 hours to complete the project alone. If Jai and Anna work together at their individual speeds, then how quickly can they complete the project?