<image> Team A and Team B simultaneously excavate two sections of tunnels of equal length. The image shows part of the graph depicting the relationship between the tunnel length y (in meters) and the excavation time x (in hours) for both teams. Please answer the following questions:
(1) In the first 2 hours of excavation, the excavation speed of Team A is ______ meters/hour, and the excavation speed of Team B is ______ meters/hour.
(2) ① Find the functional relationship between y and x for Team B; ② After how many hours will the lengths of the tunnels excavated by the two teams differ by 5 meters?