A skateboarder (m=85 kg) takes a running jump onto a friend's skateboard that is initially at rest. The friend is standing on the skateboard (mass of friend + skateboard = 110 kg). After landing on the skateboard, the velocity of the board plus the two skateboarders is 3.0 m/s. What was the horizontal component of the velocity of the jumping skateboarder just before he landed on the skateboard?