A 3-m-high tank filled with water has a discharge valve near the bottom and another near the top. If these two valves are opened…..

Okay, let's break this down.

1. First, we have a tank that is 3 meters high and it's filled with water.

2. This tank has two valves, one near the bottom and one near the top. Valves are like doors that can control the flow of the water.

3. If these two valves are opened, the water will start to flow out from both valves.

4. The water from the bottom valve will flow out faster than the water from the top valve. This is because the pressure at the bottom of the tank is higher due to the weight of the water above it.

5. As the water level in the tank decreases, the pressure at the bottom valve also decreases, so the speed at which the water flows out from the bottom valve will decrease over time.

6. On the other hand, the water from the top valve will flow out at a relatively constant speed because the pressure at the top of the tank is always the same - it's just the normal atmospheric pressure.

7. Eventually, when all the water has flowed out, both valves will stop discharging water.

So, in summary, if you open two valves at the top and bottom of a tank full of water, the water will flow out faster from the bottom valve due to the higher pressure, but this speed will decrease as the water level drops. The water from the top valve will flow out at a more constant speed.