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OpenStudy (anonymous):
Could somebody pretty please (with a cherry on top) help me with this question? I really need to know. I've got an exam tomorrow! Dorothy drives from Rotterdam to Amersfoort and then back again. On the way back her average speed is 10km/h faster than her speed on the way there. The total journey is 150 km and it takes her one and a half hours. Calculate the average speed of her journey from Rotterdam to Amersfoort.
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