The amount of time it takes a swimmer to swim a race is inversely proportional to the average speed of the swimmer.

Question

A swimmer finishes a race in 60 seconds with an average speed of 5 feet per second. Find the average speed of the swimmer if it takes 75 seconds to finish the race.

Answer 1

y=k/x

60=k/5

300=k, the constant of proportionality

 

75=300/x

x=300/75

x=4 feet per second