on a 120 track a train travels the first 30 km at uniform speed of 30km/h . how fast must it travel the next 90km so as to average 60km/hr for the entire trip
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Speed of the train in the first 30 km, v1 = 30 km/h Speed of the train in the next 90 km, v2 (to be determined) Average speed = 60 km/h = (v1 + v2)/2 = (30 km/h + v2)/2 ⇒ v2 = 90 km/h
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