from collections import *
from itertools import *
from functools import cache, partial
from pprint import pprint
import sys
from typing import Any, Final

try:
    from icecream import ic
except ImportError:  # Graceful fallback if IceCream isn't installed.
    ic = lambda *a: None if not a else (a[0] if len(a) == 1 else a)  # noqa
debug = partial(print, file=sys.stderr)
dpprint = partial(pprint, stream=sys.stderr)
sys.setrecursionlimit(10**6)
MOD = 998244353

T: Final = int(input())


def f(N: int, M: int) -> int:
    s = (N + 3) // 4
    if s * 8 - N >= M:
        return s
    return (N + M + 7) // 8
    # x = (M - s * 8) // 2
    # return (x + 7) // 8 + s


for _ in range(T):
    N, M = map(int, input().split())
    print(f(N, M))