At four o'clock, the minute hand is behind the hour hand: 4*30= 120 degrees, so if you want the two hands to coincide, the minute hand will pursue 120 degrees. According to the "principle of pursuit", it is concluded that:

Time: 120/(6-0. 5)=240/ 1 1.

That is, 4: 240/ 1 1, and the two stitches coincide.