Average Velocity problem

1. Nov 8, 2005

cocoavi

I had a physics problem which I had some problem understanding. The problem is:

You plan a trip on which you want to average 90km/h. You cover the first half of the distance at an average speed of only 48km/h. What must your average speed be in the second half of the trip to meet your goal? Note that the velocities are based on half the distance, not half the time. Is this reasonable?

2. Nov 8, 2005

Tubs

Just plug in the values you know to the average velocity formula and set vf to x

3. Nov 8, 2005

cocoavi

yes I know that if the question had given me any values at all.. but the problem is, that was what the book has given me.. that's all the information I have.

4. Nov 8, 2005

Tubs

It is possible to solve it with the information given just think about it logically and take a look at that Vavg formula.