a train travel a distance of 15 km with a speed of 30 km h -1 and remaining distance of 15 km with a speed of 45 km h -1 . find its average speed in km h -1 .
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a train travel a distance of 15 km with a speed of 30 km h -1 and remaining distance of 15 km with a speed of 45 km h -1 . find its average speed in km h -1 .
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Answer:
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