If Y Varies Inversely as X, Find the Inverse Variation

Multiple Choice

If y varies inversely as x, find the inverse variation equation for the situation.
-The amount of time it takes a swimmer to swim a race is inversely proportional to the average speed of the swimmer. A swimmer finishes a race in 120 seconds with an average speed of 5 feet per second. Find the average speed of the swimmer if it takes 200 seconds to finish the race.

A) 5 feet per second
B) 2 feet per second
C) 3 feet per second
D) 4 feet per second