You can put this solution on YOUR website! Hello,
First let's find how much grass there is to cut by subtracting 1290 from 1600.
That gives us 310 sq ft.
Now divide 2 sq ft per minute into 310 sq ft. to give us:
Now if the yard is 1600 st then it would take:
800 seconds or 13 1/3 minutes.
The problem isn't totally clear what is to be cut.