A river 3 meters deep and 40 meters wide is flowing at the rate of 2 km per hour. How much water will fall into the sea in a minute?

Depth of the river = 3 meters
Width of the river = 40 meters
Speed of the river = 2 km per hour = 2000 meters per hour (since 1 km = 1000 meters)

Step 1:-Calculate the volume of water flowing per hour.

The volume of water flowing per hour can be calculated using the formula:
Volume = Length × Width × Depth

Here, the length is the distance the water flows in one hour, which is 2000 meters.
So, the volume of water flowing in 1 hour is:

Volume per hour = 2000 × 40 × 3 = 240,000 cubic meters

Step 2:- Convert the volume from per hour to per minute.

Since there are 60 minutes in an hour, the volume per minute is:
Volume per minute = 240,000 ÷ 60 = 4,000 cubic meters

Hence the volume of water flowing into the sea in one minute is 4,000 cubic meters