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A bus travels the first one third distance at a speed of 10 km hr ,the next one third distance at a speed of 20 km hr and the next one third distance at a speed of 30 km hr .find the average speed of the bus

Answer» A bus travels the first one third distance at a speed of 10 km hr ,the next one third distance at a speed of 20 km hr and the next one third distance at a speed of 30 km hr .find the average speed of the bus


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