Question

What is the discharge of water moved by a river that has an area of 750m and is traveling 4 m/s? 300 m/s 3000 m/s 750 m/s 4500 m/s

Answer 1

Assuming the 750 m² is the river's cross section, and not some random surface measurement, the discharge is simply the product 750 * 4 = 3000 m³/s.