def main():
	seat_max_min()

def seat_max_min():
	t = input()
	case = [input() for _ in range(int(t))]
	case = [i.split() for i in case]
	for n, m in case:
		n_line = 0
		final_line = 0
		remaining_seats = 0
		if int(n) % 4 != 0:
			n_line = int(n) // 4 + 1
			remaining_seats = n_line * 4 + (4 - int(n) % 4)
		else:
			n_line = int(n) / 4
			remaining_seats = n_line * 4
		if remaining_seats < int(m):
			m_left = int(m) - remaining_seats
			if m_left % 8 != 0:
				final_line = n_line + m_left // 8 + 1
			else:
				final_line = n_line + m_left / 8
		print(max(int(n_line), int(final_line)))

if __name__ == '__main__':
	main()