Question
The distance between Winnie's home and the stationery shop is 420 m. After walking a distance from her home to the stationery shop, she stopped and walked 90 m back to a zoo. If the zoo is 190 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 Winnie's home and the stationery shop is 420 m. After walking a distance from her home to the stationery shop, she stopped and walked 90 m back to a zoo. If the zoo is 190 m away from her home, how far had she walked before she stopped and walked back?