Tinker allows you to create watch face widgets for your iPhone's home screen and the lock screen (via StandBy mode). You can ...

1 hour is made up of 60 minutes, and this is shown with one full turn of the minute hand around the clock's face, whilst the hour hand moves on just one more number. Clock: Alright, let’s go!

it has moved 5 minutes. There are 12 numbers around the clock face, and each interval is 5 minutes… 12 × 5 = 60 minutes in an hour. Let's use this knowledge to tell the time on the clocks below.