Question

9h 20min10s plus 1h 39min 55s

Answer 1

10h 59mts 65sec

Answer 2

of course people would change the 65 seconds to 1 minute 5 seconds and add the minutes up.

Answer 3

i really dont get this stuff:(

Answer 4

You change seconds into minutes (if you have enough seconds)

Like using a clock:
If it is 11:55 and you add 10 minutes, you could say it is 11:65 but the 65 can be changed to 1:05 to make it 12:05