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 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. 48 km/hr

C. 36 km/hr

D. None of these

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