#6
- Calculate how fast the ESCALATOR is moving.
- You are given the speed of the person.
- Part A: When the person is walking UP on the MOVING escalator, you add the speeds. The distance traveled is the same. Solve for time.
- Part B: When the person is walking DOWN the "up" escalator, you subtract the speeds. The distance traveled is the same. Solve for time.
- This is a relative motion problem. If a person in Car B (the slower moving car) looks back at Car A (the faster moving car), how fast is Car A approaching? That's the relative speed.
- Once you have the relative speed, you are given the distance between the cars, solve for time.
- WATCH THE UNITS! The relative speed is in Km/hr, the distance is in meters, we're looking for the time in seconds. CONVERT THE RELATIVE SPEED FROM Km/hr TO m/s BEFORE YOU TRY TO SOLVE.