Question: On her vacation last summer, Trisha walked all over New York City to buy souvenirs. First, she walked 0.1111111111111111 of a mile from her hotel to a postcard shop. Then she walked 0.1111111111111111 of a mile from the postcard shop to a T-shirt shop and 0.6666666666666666 of a mile from the T-shirt shop back to the hotel. How many miles did Trisha walk in all?
Answer: 0.8888888889