1 Can you explain how this works?

2 I’d like to know how long the flight to Australia took.

3 Do you know how long it takes to learn a foreign language?

4 Has she told you if/whether she has reached a decision yet?

5 Do you know what time you are leaving?

6 I wonder if/whether Annie knows about computers.

7 Do you remember if/whether Susana likes classical music?