on a120 km track a train Travels the first 40 km at a uniform speed of 30 km per hour how fast must the train travel the next 90 km so as to average 60 km per hour for the entire trip...plz solve in detail
on a120 km track a train Travels the first 40 km at a uniform speed of 30 km per hour how fast must the train travel the next 90 km so as to average 60 km per hour for the entire trip...plz solve in detail
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