The following question is accompanied by two statements (I) and (II). You have to determine which statement(s) is/are sufficient/necessary to answer the questions. Find the average speed of the bus. I. The total time taken by the bus is 2/3 hours. II. The bus covers the whole journey in 4 equal parts at speeds of 20 km/h, 40 km/h, 60 km/h and 80 km/h respectively
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