The longest bicycle in the world was built in New Zealand in 1988. It is more than 20 m in length, has a mass of 3.4 x 102 kg, and can be ridden by four people at a time. Suppose four people are riding the bike southeast when they realize that the street turns and that the bike won't make it around the corner. All four riders jump off the bike at the same time and with the same velocity (9.0 km/h to the northwest, as measured relative to Earth). The bicycle continues to travel forward with a velocity of 28 km/h to the southeast. If the combined mass of the riders is 2.6 102 kg, what is the velocity of the bicycle and riders immediately before the riders' escape?