Physics 7 and Astronomy. Exercise 8 task 4

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4. For the first 0.5 hours the cyclist crossed 10 km, the next 12 minutes he rode at a speed of 25 km / h. The remaining 9 km was traveling at a speed of 18 km / h. What is the average speed of the cyclist: a) all the way through? B) in the first half of the way?


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