person makes four trips of the same distance. He had a speed of 50 km / h in the first journey and his speed in the next journey was half the speed of the previous journey. What was the average speed (in km / h) of the person in these four trips?
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Keri rollerblades to school, a total distance of 4.5km. She has to slow down twice to cross busy streets, but overall the journey takes her 0.65h.
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