A walker starts at the origin at 1:00 PM and walks 3.0 km from the origin toward the WEST to point A. She arrives at point A at 2:30 PM. She then walks from point A 2.0 km toward the WEST to point B and arrives at point B at 3:45 PM. The walker's average velocity for the entire trip is
A) 1.8 km/hr toward the EAST.
B) 1.8 km/hr toward the WEST.
C) 1.3 km/hr toward the WEST.
D) 1.3 km/hr toward the EAST.
E) 0.36 km/hr toward the WEST.

Question

Quizplus · Accepted Answer

The walker covers a total distance of 3.0 km + 2.0 km = 5.0 km toward the WEST from 1:00 PM to 3:45 PM, which is a total time of 2 hours and 45 minutes or 2.75 hours. The average velocity is total displacement divided by total time, which is 5.0 km / 2.75 hr = 1.8 km/hr toward the WEST.

A Walker Starts at the Origin at 1:00 PM and Walks