If Bikash travels 3/7th of his journey at 30 km/h and remaining 4/7 th journey at 20 km/h. If the total distance travelled is 210km , what is his average speed during the whole journey?

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If Bikash travels 3/7th of his journey at 30 km/h and remaining 4/7 th journey at 20 km/h. If the total distance travelled is 210km , what is his average speed during the whole journey?