Lucy is out for a 8.70km walk. She walks the first 4.20km at an average speed of

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Question:

Lucy is out for a 8.70km walk. She walks the first 4.20km at an average speed of 5.00k(m)/(h)r. She then stops for a 15 minute rest. She continues on her journey and walks the remaining distance in 1 hour and 49 5 minutes. What is her average velocity for the entire journey?