To find the time it will take to empty the tank, we can use the formula for the volume of a cylinder: V = πr^2h. Given that the diameter is 1.4 feet, the radius (r) is half of that, which is 0.7 feet. The height (h) is 4.5 feet. Plugging these values into the formula, we get V = 3.14 * (0.7)^2 * 4.5. Calculating this, we find that the volume of the tank is approximately 6.44 cubic feet.
To find the time it will take to drain the tank, we divide the volume by the rate of drainage: 6.44 / 2.3. This gives us approximately 2.80 minutes. Rounding this to the nearest minute, it will take approximately 3 minutes to empty the tank.