Question

add the following 15 hours 38 minutes 35 seconds 5 hours 44 minutes 23 seconds and 8 hours 58 minutes 33 seconds​

Answer 1

Answer:

30 hours 21 minutes 31 seconds

Step-by-step explanation:

Just add all the seconds if it reaches 60 add 1 to the minute, then add all the minutes if it reaches 60 add 1 to the hour

Answer 2

Answer:

30h+21m+31s

Step-by-step explanation:

total second =35+23+33

=91

total minutes =44+38+58=140

=140+91s=141+31s

total hours =15+5+8=28

=( 28+2)h+21m+31s

=30h+21m+31s