Nine people, including three toddlers, were rushed to the hospital yesterday after separate bus crashes in South Yarmouth and Quincy, police said.The first accident occurred shortly after 7 a.m. at Regional and Station avenues in South Yarmouth, where a Jeep Liberty carrying four students headed to Dennis-Yarmouth Regional High School collided with a school bus carrying 15 students en route to Cape Cod Regional Technical High School in Harwich, Deputy Police Chief Steven G.