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Addition of Hours, Minutes and Seconds
We will discuss here about the addition of hours, minutes and seconds.
Let us consider some of the examples on adding time.
Let us consider some examples:
1. Add 3 hr. 25 min. 15 sec. and 5 hr. 20 min. 25 sec.
 |
We added hours, minutes and seconds respectively. |
2. Add 5 hr. 45 min. 12 sec. and 7 hr. 50 min. 24 sec.
 = 12 hr. 1 hr. + 35 min. + 36 sec. = 13 hr. 35 min. 36 sec. |
12 hr. 95 min. 36 sec. = 12 hr. + (60 min. + 35 min.) + 36 sec.
= 12 hr. 1 hr. + 35 min. + 36 sec. = 13 hr. 35 min. 36 sec. |
3. Add 30 hr. 45 min. 45 sec. and 15 hr. 35 min. 17 sec.
 = 45 hr. 1 hr. 20 min. 1 min. 11 sec. = 46 hr. 21 min. 11 sec. |
45 hr. 80 min. 71 sec. = 45 hr. + (60 min. + 20 min.) + (60 sec. + 11 sec.)
= 45 hr. + 1 hr. + 20 min. + 1 min. + 11 sec. = 46 hr. 21 min. 11 sec. |
4. Add 24 hr. 30 min. 20 sec. and 18 hr. 37 min. 54 sec.
 = 42 hr. 1 hr. 7 min. 1 min. 14 sec. = 43 hr. 8 min. 14 sec. |
42 hr. 67 min. 74 sec.
= 42 hr. + (60 min. + 7 min.) + (60 sec. + 14 sec.) = 42 hr. + 1 hr. + 7 min. + 1 min. + 11 sec. + 14 sec. = 43 hr. 8 min. 14 sec. |
5. Add 5 hours 40 minutes and 2 hours 15 minutes.
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Step I: Add the minutes. 40 + 15 = 55 minutes Step II: Add the hours 5 + 2 = 7 hours |
 Answer: 2 hours 15 minutes. |
6. Add 8 hours 35 minutes 40 seconds and 6 hours 30 minutes and 45 seconds.
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Step I: Add the seconds. 40 + 45 = 85 seconds = 60 seconds + 25 seconds = 1 minute 25 seconds Step II: Write 25 under seconds and carry 1 to minutes. Step III: Add the minutes. 1 + 35 + 30 = 66 minutes = 66 minutes + 6 minutes = 1 hour 6 minutes Step IV: Write 6 under minutes and carry 1 to hours. Step V: Add the hours. 1 + 8 + 6 = 15 hours Write 15 under hours. |
 Answer: 15 hours 6 minutes 25 seconds |
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