Question: You might have noticed that the Moon rises and moves across the night sky a little later each night. This caus?
While SplashFrog answer is concerning the Moon movement, let me clarify a bit by saying that days are getting longer, therefore nights are getting shorter causing the time difference you are talking about.
Concerning the rest of your question, it sounds like you are asking for "help" with your math homework hmmm! Well all the help I am going to give you is 1) figure out the amount of minutes that there are between 6:20 and 12 noon. 2) How many times does 50 fits into that total amount of mins. The rest you figure it out!
Because the Earth changes it's axis slightly each day. This is why we have summer and winter.
On day 1: High tide is at 6:20
Day 2: 7:10
Day 3: 8:00
Day 4: 8:50
Day 5: 9:40
Day 6: 10:30
Day 7: 11:20
Day 8: 12:00
This web page will explain the motion of the moon: http://cseligman.com/text/sky/moonmotion…