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Someone Mysterious
Answers (1)
Speed= distance/time. At 40km/h you will take 3/4 hours to do 30km. At 60 km you will take 1/2 hours. So, the total time is 3/4 + 1/2 = 1 and 1/4. Hence you will travel 60km in 1 and 1/4 hours => average speed = 6/1 and 1/4= 60x4/5 = 48km. So, the answer
