Interview questions - Clock

Since I started participating in interviews for junior developers in the company I'm currently working for I started thinking of logical questions to ask the candidates.
That's the way the "clock questions" came out and I'll share two of them with you now.

Clock

1. What's the angle questions

What's the angle between clock's hands when the time is [HH:MM].
For example:

What's the angle between clock's hands when the time is 11:50?

2. How many times questions

How many times do the hands of a clock [action] [period].
For example:

How many times do the hands of a clock overlap within a day?

Can you answer these questions? :)

Lucky giraffe