On a 120 km track, a train travels the first 30 km a uniform
speed of 30km/hr. How fast must the train travel the next
90km so as to average 60km/hr for the entire trip?
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On a 120 km track, a train travels the first 30 km a uniform
speed of 30km/hr. How fast must the train travel the next
90km so as to average 60km/hr for the entire trip?
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