Depends on how many are leap years.
138 seconds.
138 / 12 = 11.5 years.
2 minutes and 18 seconds or 2.3 minutes.
The answer depends on 138 WHAT! Seconds, days, years? And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
That's 138/9 hours.
11 years and 6 months.
The answer to the word equation "138 ss in r" is "138 seconds in a minute."
16 years = 504,910,816 seconds.
There are 1,452,576,000 seconds in 46 years.
There are 1,358,724,800 seconds in 43 years.
There are 1263141040 seconds in 40 years
10 years = 315,569,260 seconds.