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On 120 km track ,a train travels the first 30 km at a uniform speed of 30 km/h.how fast the train travel the

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next 90 km so as to average 60 km/h for the entire trip

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  1. on a 120 km track a train travel the first at a uniform sped of 30 km/hr. how fast must the train travel the next 90 km so as to average 60 km for the entire trip?


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