A truck traveled east 25 km in 30 minutes, north 20 km in 45 minutes, and then west 25 km in 20 minutes.  What is the displacement of the truck?

The displacement of the truck can be calculated by considering the final position of the truck relative to its initial position.

Step 1: Determine the final position in the east-west direction. The truck traveled east 25 km and then west 25 km. So, in the east-west direction, the displacement is 25 km (east) - 25 km (west) = 0 km.

Step 2: Determine the final position in the north-south direction. The truck traveled north 20 km. So, in the north-south direction, the displacement is 20 km (north).

Step 3: Combine the displacements in the east-west and north-south directions. Since the displacement in the east-west direction is 0 km and the displacement in the north-south direction is 20 km north, the overall displacement of the truck is 20 km north.