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Q.) Between the two stations, a train accelerates from rest uniformly at first, then moves with constant velocity and finally retards uniformly to come to rest. If the ratio of the time taken be 1:8:1 and the maximum speed attained be 60 km/h, then what is the average speed over the whole journey?
[A]48 km/h
[B]52 km/h
[C]54 km/h
[D]56 km/h