Question
The distance between Shannon's home and the shop is 320 m. After walking a distance from her home to the shop, she stopped and walked 70 m back to a pet sanctuary. If the pet sanctuary is 140 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 Shannon's home and the shop is 320 m. After walking a distance from her home to the shop, she stopped and walked 70 m back to a pet sanctuary. If the pet sanctuary is 140 m away from her home, how far had she walked before she stopped and walked back?