How to convert 90 seconds to minutes?
We know (by definition) that:
We can set up a proportion to solve for the number of minutes.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 minute is equal to 0.666666666666667 times 90 seconds.
It can also be expressed as: 90 seconds is equal to minutes.
An approximate numerical result would be: ninety seconds is about zero minutes, or alternatively, a minute is about zero point six seven times ninety seconds.
 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.