You Land Your Inflatable Boat on a Sandbar at High

Multiple Choice

You land your inflatable boat on a sandbar at high tide in Southeast Alaska,which has a large semi-diurnal tide.You intend to be away from the boat for 12 hours,but come back early after only 8 hours.Your boat is,unfortunately,400m from shore.How long will you have to wait to be able to use your boat (assuming you can't carry it) ?

A) 12 hours and 25 minutes
B) 6 hours and 12 minutes
C) 6 hours
D) 4 hours and 25 minutes