A rectangular tank has a base measuring 225 meters by 162 meters. Through an opening of 60 cm by 45 cm, water flows in. At what velocity must the water enter so that the water level rises by 20 cm within 5 hours?

Explanation

Given the tank's base dimensions and the desired increase in water level over 5 hours, calculating the volume increase and dividing by the aperture area and time yields the required inflow speed. Among the options, 5400 meters per hour is the correct velocity for the water to rise 20 cm in 5 hours.