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3 A train travels at 90 km hlfor 0.50 hr 55 km h1 for the next 0.20 h and then 105 km h'1 for the

3 A train travels at 90 km hlfor 0.50 hr 55 km h1 for the next 0.20 h and then 105 km h'1 for the next 0.75 h. a What is the train's average speed over the entire journey? b What is the minimum possible magnitude of the train's average velocity

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