A train moves with a speed of 30 km/hr for 12 minutes and for next 8 minutes at a speed of 45 km/hr the average speed of the train is: (A) 37.5 Km/hr (B) 36 km/hr (C) 48 km/hr (D) None of these 20
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(A) 37.5 Km/hr
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the right answer is 36km/h
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