Distance between Jammu and Agra is 778 km. A train covers the journey from Jammu to Agra at 84 km per hour and returns back to Jammu with a uniform speed of 56 km per hour. Find the average speed of the train during the whole journey?

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Distance between Jammu and Agra is 778 km. A train covers the journey from Jammu to Agra at 84 km per hour and returns back to Jammu with a uniform speed of 56 km per hour. Find the average speed of the train during the whole journey?