Question: On her vacation last summer , Trisha walked all over New York City to buy souvenirs . First , she walked 0.11 mile from her hotel to a postcard shop . Then she walked 0.11 mile from the postcard shop to a T-shirt shop and 0.67 mile from the T-shirt shop back to the hotel. In all , Trisha walked _____ miles .
Answer: 0.89