The local amusement park is a popular field trip destination. This year the senior class at High School A and the senior class at High School B both planned trips there. The senior class at High School A rented and filled 6 vans and 9 buses with 354 students. High School B rented and filled 2 vans and 6 buses with 220 students. Each van and each bus carried the same number of students. How many students can a van carry? How many students can a bus carry?