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On 60 km track a train travelled the 1st 30 km at uniform speed of 30 km/hr. How fast must the train travelled the next 30 km so that the average speed is 40 km/hr for the entire trip

Answer» On 60 km track a train travelled the 1st 30 km at uniform speed of 30 km/hr. How fast must the train travelled the next 30 km so that the average speed is 40 km/hr for the entire trip


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