278 seconds in hours
Result
The conversion result is: 278 seconds is equivalent to 0.0772222222222222 hours.[1]
Conversion formula
How to convert 278 seconds to hours?
We know (by definition) that: 1 sec ≈ 0.00027777778 hr.
We can set up a proportion to solve for the number of hours.
1 sec / 278 sec ≈ 0.00027777778 hr / x hr
Now, we cross multiply to solve for our unknown x:
x hr ≈ (278 sec / 1 sec) * 0.00027777778 hr → x hr ≈ 0.07722222284000001 hr
Conclusion:
278 sec ≈ 0.07722222284000001 hr

Conversion in the opposite direction
The inverse of the conversion factor is that 1 hour is equal to 12.9496402877698 times 278 seconds.
It can also be expressed as: 278 seconds is equal to 1 / 12.9496402877698 hours.
Approximation
An approximate numerical result would be: two hundred and seventy-eight seconds is about zero point zero eight hours, or alternatively, a hour is about twelve point nine four times two hundred and seventy-eight seconds.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.