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**1. The problem statement**

I find it sometimes difficult to come up with the equation relevant to the question. If any one has any tips, your help is appreciated.

**2. Relevant example**

For example:

A passenger climbs aboard a northbound bus and walks toward the back at a rate of 1.8m/s. The bus starts off up the street at 9.2m/s. What velocity will the passenger appear to be walking relative to:

A) a person who is walking 2.1 m/s south along the sidewalk

B) a person who is walking 2.1 m/s north along the sidewalk

## The Attempt at a Solution

Let p = passenger in the bus

b = Bus

g = guy who is walking

My attempt: a) Vpg = Vpb + Vbg is this correct? why or why not? thanks.