on a 120km track , a train travels a first 30 km at a uniform speed of 30 km / hr ... how fast must the train travel the next 90km so as to average 60km/h for the entire trip
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On a 120 km track, a train travels the first 30 km with a uniform speed of 30 km/h. How fast must the train travel the next 90 km so as to average 60 km/h for the entire trip? A. 65 km/h.
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