suppose you are driving on a straight

v1+v2=88+104 =192 km/h

To determine the truck's velocity relative to you, you need to calculate the relative velocity between the truck and your car. Here's how you can do that:

1. Convert the speeds of both vehicles to the same unit:
- Your speed: 88 km/h
- Truck's speed: 104 km/h

2. Determine the direction of the two vehicles:
- Since you are driving in opposite directions on a two-lane road, the relative direction is the sum of the speeds. Since the truck is approaching you, we consider its speed as negative.

3. Calculate the relative velocity:
- The relative velocity is the difference between the two speeds.
- In this case, it will be 88 km/h (your speed) + (-104 km/h) (truck's speed).
- The resulting relative velocity is -16 km/h.

Therefore, the truck's velocity relative to you is -16 km/h, indicating that it is moving towards you at a speed of 16 km/h.