A train leaves station 'A' for station 'B'. The train travels along a straight line without any halts be-
tween the stations. During the first and last 200 m of its journey, the train has uniform acceleration
and retardation both equal to 1 ms respectively. For the rest of the journey, the train maintains
uniform speed. Calculate the average speed of the train, given the distance between the two stations
is 4 km.
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speed distance/time
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