WoSo at 7 PM, the hour hand is on 7 and the minute hand is on 12.
That is a gap of five hours. The whole clock has twelve hours.
We know that a clock is a circle. A circle has 360 degrees. So, the 12 hours of a clock make 360 degrees. Each hour is 360/12=30 degrees. So, 5 hours makes 30*5=150 degrees.