The distance between two places Kolkata and Banaras is 778 km. A car covers the travelling from Kolkata to Banaras at a uniform speed of 84 kmph and returns back to Kolkata with a uniform speed of 56 kmph. Find the average speed of car during the whole travelling.

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The distance between two places Kolkata and Banaras is 778 km. A car covers the travelling from Kolkata to Banaras at a uniform speed of 84 kmph and returns back to Kolkata with a uniform speed of 56 kmph. Find the average speed of car during the whole travelling.