According to the time unit conversion, 1 hour, (h)=60 minutes (min), and the conversion rate of hours and minutes is 60. According to the calculation, 0.5*60=30, then 0.5h is 30 minutes (min).

Minute means the length of time, English: minute, which originally means "tiny" and also means min (more commonly used in mathematical terms). Common unit conversion is: one minute =60 seconds. One day = 1 440min, 1 hour = 60min,1minute = 60s; A moment = 15 minutes, and a word =5 minutes (used in southern Fujian and Guangdong).