When is 5: 50 plus 2: 30?

Calculation method: 1 hour =60 minutes, so 5: 50+2: 30 = (5+2)+(50+30) = 7: 00+80 = 7: 00+1:20 = 8: 20.

Conversion: 1 day =24 hours = 1440 minutes, 1 hour =60 minutes, 1 minute =60 seconds; A moment = 15 minutes, and a word =5 minutes (used in southern Fujian and Guangdong).

Extended data:

Common time units in life are: millisecond ms, minute min, hour h, day) d, month m, year y, etc.

Time unit conversion relationship:

1 year = 12 months (flat year and leap year 13 months); 1 quarter =3 months; 1 week =7 days; 1 day =24 hours; 1 hour =60 minutes; 1 min =60 seconds.

Angle relation of each pointer of the clock:

(1) An ordinary clock is equivalent to a circle, and its hour hand or minute hand is equivalent to walking 360 degrees.

(2) The angle of each large grid on the clock is 30.

(3) The angle of the hour hand every 1 min should be 0.5.

(4) The angle of minute hand per 1 min should be: 6.

Several key angles on the clock face:

(1) 9: 00 am sharp: the angle between the hour hand and the minute hand is 90 degrees.

(2) noon 12 o'clock: the included angle between the hour hand and the minute hand is 0 degrees.

3 pm sharp: the angle between the hour hand and the minute hand is 90 degrees.

(4) 6 pm: The included angle between the hour hand and the minute hand is 180 degrees.