import math
for _ in [0]*int(input()):
	n, m = map(int, input().split(" "))
	t_ans, mod = math.ceil(n/4), n%4
	m -= (t_ans * 4)
	if n > 0:
		m -= (4 - mod)
	m_ans = math.ceil(m/8)
	if m_ans > 0:
		t_ans += m_ans
	print(t_ans)