The speed of the minute hand relative to the hour hand is 1 1 times of the hour hand speed, and112 of the minute hand speed.

When in a straight line, the minute hand walked for 5 minutes (relative to the hour hand).

The minute hand scale is 5 *12/11= 60/1= (minute scale).

That is, 60/ 1 1 minute after 7 o'clock.

(About 7: 05: 27)

There are two situations at right angles,

That is to say, the minute hand moves 20 minutes or 50 minutes relative to the hour hand.

The minute hand scale is as follows

20 *12/11= 240/11(minute scale)

50 *12/11= 600/11(minute scale)

That is, 240/ 1 1 min after 7 o'clock or 600/1min after 7 o'clock.

(about 7:2 1:49 and 7:54:33)

Pay attention to understand the meaning of "relative to".