A drone car with a mass of 1000 kg is travelling down the road with a speed of 12 m/s. It collides with another drone car half the mass moving at -17 m/s. After the collision, the 1000 kg car is moving at -1.3 m/s. What is the speed of the other drone car after the collision?

Please help me start off this problem.

conserve momentum

1000*12 + 500(-17) = 1000(-1.3) + 500v
solve for v