1) If the floodgate is not opened, the inflow of river water will make the water level rise by X meters per hour; if there is no inflow of river water, the floodgate will be opened to make the water level drop by Y meters per hour.

2x-2y=0.06

4×3x-4y=0. 1

Solution: x=0.27

y=0.3

A: The inflow of river water makes the water level rise by 0.27 meters per hour. When the river is not growing, open a gate to make the water level drop by 0.3 meters per hour.

2)10× 8× 0.3-8× 0.27 = 2.4 >1.2 Therefore, it is possible to lower the water level below the warning line within 8 hours.