A ship anchored at sea is rocked by waves that have crests 14 m apart The waves travel as 7.0 ms How often do the wave crests reach the ship?

A wave crest hits the ship. The next wave crest is 14 m away and it is traveling at 7 meters per second. So in two seconds it will travel 14 m . Similarly, the next wave crest will hit in two seconds etc. So the crests hit the ship every two seconds.