T = int(input())

for _ in range(T):

    N, M = map(int,input().split())

    k = 0
    while N - 4*(k+1) >= 0:
        k += 1
    m = N - 4*k

    if M <= 4*k:
        if m > 0: print(k+1)
        else    : print(k)
    else:
        M -= 4*k
        M -= (8-m)
        k += 1

        l = 0
        while M - 8*(l+1) >= 0:
            l += 1
        m = M - 8*l
        if m > 0: print(k+l+1)
        else    : print(k+l)