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

Question

Quizplus · Accepted Answer

In a semi-diurnal tide, there are two high tides and two low tides each day, approximately 6 hours apart. After 8 hours, the tide would be low, and you would need to wait about 4 hours and 25 minutes for the next high tide to float your boat.

You Land Your Inflatable Boat on a Sandbar at High