The notation used is 1315 minutes and 36 secs.
There are 60 minutes in 1 degree
So in 1315 minutes we have X degrees
So X * 60 = 1315 * 1
X = 21.916 degrees
Also there are (60*60) seconds in 1 degree
In 36 seconds we have X degrees.
Hence X * 3600 = 36 * 1
X = 36/3600 = 0.01 degrees.
So we have 21.916 + 0.01 = 21.926 degrees.
But Suppose the question meant to write 13°15'36" instead if 1315'36"
Then to calculate the decimal degrees, we follow the same method like the one above.
So we have 13 + (15/60) + (36/60) = 13 + 0.25 + 0.6 = 13 85
