What velocity must a 1340 kg car have in order to reach the momentum of a 2680 kg truck traveling at a velocity of 15 m/s to the west?

Momentum is the product of the mass of a given body and its velocity,
therefore mathematically; momentum= mass (kg) × velocity (m/s). 
A body at rest will have zero momentum since the velocity of such a body is considered to be zero.
The SI units of momentum is kg*m/s
Momentum of the truck = 2680 kg × 15 m/s 
                                      = 40200 kg*m/s
 Momentum of the car = 1340 kg × v ( unknown velocity)
                                    =  1340 v kg*m/s
When the car attains the momentum of the truck the its speed will be;
               1340 v = 40200
                        v = 30 m/s

Therefore, for the car to attain the momentum of the truck it will need to travel with a speed of 30 m/s.