Question
The distance between Shiyun's home and the shop is 580 m. After walking a distance from her home to the shop, she stopped and walked 20 m back to a zoo. If the zoo is 170 m away from her home, how far had she walked before she stopped and walked back?
2 m

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The distance between Shiyun's home and the shop is 580 m. After walking a distance from her home to the shop, she stopped and walked 20 m back to a zoo. If the zoo is 170 m away from her home, how far had she walked before she stopped and walked back?