Acoastline on earth experience a high tide at 6 am. at what approximate time will the next low tide occur and why?

1) 6 pm, because the cosine will turn 90° from the moon

2) 6 pm, because the coastline will turn 180° from the moon

3) 12 noon, because the coast line will turn 90° from the moon

4) 12 noon, because cosign will turn 180° from the moon