on a 120 km track A train travels the first 30 kilometre at a uniform speed of 30 kilometre per hours calculate the speed with which the train should move rest of the track so as the average speed is 60 kilometre per hour is the entire trip
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60= 30/30 + x / 90
60 = 90 + x / 90
5400 = 90 + x
5310 km / hr = x
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