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Helen rode her bike from home to the river, which is 4 km away. It took her 9 minutes. She rode home using a shorter
Helen rode her bike from home to the river, which is 4 km away. It took her 9 minutes. She rode home using a shorter route of 3 km. This only took her 6 minutes.What was Helen's average speed, in km/h, for the trip to the river and back?
Average speed for the trip: _______km/h
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