To add the two quantities, write them as follows:

18 degrees 35 minutes 29 seconds

+

22 degrees 55 minutes 41 seconds

[For adding seconds, minutes and degrees, the rule is 60 seconds make for a minute and 60 minutes make for a degree.]

Starting with the seconds, the sum is 70 seconds, which means 1 min 10 seconds,

Next add minutes along with carryover of 1 min from the seconds, the sum is 91 minutes, which means 1 degree 31 minutes.

Next add degrees along with the carryover of 1degree from the minutes, the sum is 41 degrees. Hence, the total is

41 degrees 31 minutes 10 seconds