---
title: "Train A travels east at a constant speed of \\(25\\text{ m/s}\\) relative to the ground, while Train B travels west at a constant speed of \\(15\\text{ m/s}\\) relative to the ground on an adjacent parallel track. A passenger on Train A walks toward the rear of the train at a speed of \\(3\\text{ m/s}\\) relative to Train A. What is the speed of the passenger relative to an observer seated on Train B?"
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/120466/"
date_modified: "2026-08-23T04:38:55+00:00"
---

# Train A travels east at a constant speed of \(25\text{ m/s}\) relative to the ground, while Train B travels west at a constant speed of \(15\text{ m/s}\) relative to the ground on an adjacent parallel track. A passenger on Train A walks toward the rear of the train at a speed of \(3\text{ m/s}\) relative to Train A. What is the speed of the passenger relative to an observer seated on Train B?

Train A travels east at a constant speed of \(25\text{ m/s}\) relative to the ground, while Train B travels west at a constant speed of \(15\text{ m/s}\) relative to the ground on an adjacent parallel track. A passenger on Train A walks toward the rear of the train at a speed of \(3\text{ m/s}\) relative to Train A. What is the speed of the passenger relative to an observer seated on Train B?

- **A.** \(7\text{ m/s}\)
- **B.** \(13\text{ m/s}\)
- **C.** \(37\text{ m/s}\)
- **D.** \(43\text{ m/s}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/120466/*