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0. A train overtakes 2 persons walking at 2 km/hr and 1 km/hr respectively in the same direction and completely passes them in 9 seconds and 10 seconds. Length of the train and its speed in km/hr respectively are
75 m, 18 km/hr
80 m, 21 km/hr
60 m, 20 km/hr
50 m, 22 km/hr
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