The rate at which an object covers distance, typically measured in kilometers per hour.

• A. Speed
• B. Velocity
• C. Momentum
• D. Acceleration

Answer: (A)

The main idea here is understanding what quantity describes how fast something covers distance. That is speed. Speed measures how much distance is traveled per unit of time and is a scalar, meaning it has magnitude only and no direction. This is why it’s typically expressed in kilometers per hour.

Velocity, in contrast, includes both speed and direction—it's a vector. Momentum depends on mass and velocity, so it involves how fast plus the object's mass, not just the rate of distance. Acceleration is the rate at which velocity itself changes over time, not the rate of distance covered. So the phrase “rate at which an object covers distance” points to speed.