To convert the time it takes Lily to mow a lawn from hours to minutes, we need to find a unit fraction that cancels out the hours and leaves us with minutes.
In this case, we know that there are 60 minutes in 1 hour. So, to cancel out the hours, we need to use the unit fraction 1 hour / 60 minutes. This means that for every 1 hour, there are 60 minutes.
To convert the time from hours to minutes, we can set up a proportion:
3 hours = x minutes
1 hour 60 minutes
To solve for x, we can cross-multiply:
3 hours * 60 minutes = 1 hour * x minutes
This simplifies to:
180 minutes = x minutes
So, it takes Lily 180 minutes to mow a lawn.
Therefore, the correct unit fraction to convert hours to minutes is 1 hour / 60 minutes.