# Math Help - Traveling problem

1. ## Traveling problem

While you are traveling in a car on a straight, level inter-state highway at 90 km/h, another car passes you in the same direction; its speedometer reads 120 km/h. (a) What is your velocity relative to the other driver? (b) What is the other car's velocity relative to you?

2. Originally Posted by Dora
While you are traveling in a car on a straight, level inter-state highway at 90 km/h, another car passes you in the same direction; its speedometer reads 120 km/h. (a) What is your velocity relative to the other driver? (b) What is the other car's velocity relative to you?
Your velocity relative to the other driver is $v_y-v_o$, where
$v_y$ is your velocity, and $v_o$ is the other driver's velocity. So:

a) 90-120 = -30 km/hr

The other cars velocity with respect to you is $v_o-v_y$, so:

b) 120-90 = 30 km/hr.

RonL