A man covers 1/3rd of journey by cycle at 50 Km/h , the next 1/3 by car at 30 km/h , rest walking at 7 km/h . average speed during the whole journey . ?
If a person covers 1/3rd of his journey by cycle at 50 , the next 1/3rd by car at 30 kmph and the rest by walking at 7 km/h , what is his average speed during the whole journey ?