Question

add the following 10 hours 45 minutes 55 seconds and 9 hours 20 minutes 10 seconds
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Answer 1

Step-by-step explanation:

10 hr 45 min 55 s

9hr 20 min 10s

¹ ¹

______________

20hr 06mins 05s

_______________

1hr =60min

1min = 60s

Answer 2

20hours 6minutes 5 seconds

Step-by-step explanation:

let's start ...

first we will add the second

55 seconds + 10 seconds = 1 minute 5 seconds

then we will first add minutes, then we will add the carryover

45minutes + 20 minutes +1 minute = 1 hour 6 minutes

then we will add the hours , then we will add the carryover

10hours +9 hours +1 hour = 20 hours

total is

20 hours 6 minutes 5 seconds

(1 min =60 seconds

1 hour= 60 minutes)

DONE