Ellen walked to the store at 1:00.

Question

It takes Ellen 15 minutes to walk to or from the store.

She spent 13 minutes in the store, and then walked back home.

Answer 1

Ellen arrived at the store at 1:15 and spent 13 minutes there, so she left the store at 1:28.

Since it takes Ellen 15 minutes to walk to or from the store, she would have arrived back home at 1:43.