Answer:

Explanation:
Speed = Distance / Time
So, to find distance, we actually divide distance by rime.
Answer:
He is wrong!
Explanation:
Frequency refers to how many wave lengths pass in a second and speed is how fast the wave is traveling for example the speed of light goes really fast but has a mid-level frequency.
Hope this helps! ;-)
Can be made out of ; sand, rocks or soil if the current is not expected to be rough.