The green block (B) has a mass of 13.40 kg and is moving to the left at a speed of 3.50m/s. The red block (A) has a mass of 10.30 kg and is moving to the right. The two blocks undergo a perfectly inelastic collision. What should the velocity of the red block be in order to have the two blocks move to the right with a speed of 0.40 after the collision?