a train goes from durgapur to kolkata. speed between durgapur and burdwan is 80 km/h and speed between burdwan to kolkata is 100 km/h.and distance between durgapur to kolkata is 200 km.find the average speed.
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speed from durgapur to burdwan = 80km/h
speed from burdwan to Kolkata = 100km/h
average speed = (80+100)/2
average speed = 90km/h
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