# Homework Help: Help on velocity and displacement

1. Aug 21, 2005

### QT

Question:
Simpson drives his car with an average velocity of 48.0 km/h to the east, How long will it take him to drive 144 km on a straight highway?

now i know you start out with the given which is :
Vavg= 48.0 km/h east
delta x= 144km
delta t= ?
so you have to find the delta t but i dont know how

2. Aug 21, 2005

### H_man

Umm. Isn't this just a case of $$Speed = \frac {Distance} {time}$$

ie... re-arranging this equation.

Last edited: Aug 21, 2005
3. Aug 21, 2005

### Jameson

But make sure to include direction, as velocity and displacement are vectors.

$$\vec{v}=\frac{{\triangle}\vec{d}}{\triangle{t}}$$

Last edited: Aug 21, 2005