# Relative Velocity Sidewalk

shealya

## Homework Statement

A passenger rushing to catch a plane at the airport walks on a moving sidewalk at a speed of 3.0 km/h relative to the sidewalk in the direction that the sidewalk is moving. The sidewalk is 135 m long and moves with a steady velocity of 1.0 km/h.

The question has 4 parts:
1. 1. How long (in s) does it take for the passenger to get from one end of the sidewalk to the other, that i *to cover the 135 m? I found this to be 122s.
2. How much time does the passenger save by taking the moving sidewalk instead of just walking beside it? Here, I found out by walking, it takes 162s to walk beside it, leaving a 40s difference in time.
3. Through what distance does the passenger walk relative to the moving sidewalk? I haven't figured this one out becasue I have no idea what its even asking (yes, I know you're not supposed to say that but honestly, I don't understand what my professor is looking for).
4. and 4, the one that I have an issue on. "If the passenger has a stride of 90cm, how many steps are taken in going from one end of the moving sidewalk to the other?"

***ALL OF THESE QUESTIONS WERE COPIED AND PASTED FROM THE COMPUTER PROGRAM***

## Homework Equations

none that i can think of to apply

## The Attempt at a Solution

Since I'm really posting on here for the last part, here's what I did.

I converted 135 m (length of the sidewalk) to 13,500 cm, since the length of the stride is in cm. So then, I did 13,500cm/90cm and got 150. The computer program that my professor uses for homework said that was wrong. Then figuring that a "stride" was the length between two steps, so then I divided 150 by 2 (for 2 steps) and got 75, which was also wrong.

If anyone wants to help on what the third part is even asking (like i said, I know you're supposed to attempt them on your own but I seriously do not even understand what it is asking.)​