What is the speed ratio of the hour hand to the minute hand on the clock face

What is the speed ratio of the hour hand to the minute hand on the clock face

One turn of the hour hand is 12 hours, and the minute hand is one hour
So hour hand: minute hand = 1 / 12:1 = 1:12

On the clock face, the speed of the minute hand is that of the hour hand (), and the speed of the hour hand is that of the minute hand ()

On the clock, the speed of the minute hand is 12 times that of the hour hand, and the speed of the hour hand is 1 / 12 that of the minute hand
Because there are 12 large squares on the clock face. When the needle goes one big square, the minute hand goes one circle, just 12 large squares. So the speed of the minute hand is 12 times that of the hour hand. Conversely, the speed of the hour hand is 1 / 12 that of the minute hand

The minute hand and the hour hand on the clock face start to rotate from 12. When the minute hand rotates 3 times, how many degrees does the hour hand rotate?

3/12×360º=90º
The hour hand rotates 90 degrees;