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# What is the ratio of angular speed of minute hand to hour hand of a watch?

In a standard watch, the watch face is composed of 12 hours and 60 minutes.

One revolution of the **hour** **hand** lasts **12 hours**. Angular speed expressed in rpm of hour hand is :

One revolution of the **minute** **hand** lasts 60 minutes, or **1 hour**. Angular speed expressed in rpm of minute hand is :

We can easily conclude the ratio of angular speed of the minute hand to the hour hand is **12:1**.