I need some help understanding how to work this problem, I got it wrong on a quiz. Can someone please help?

A student is running a 10-kilometer race. He runs 1 kilometer every 4 minutes. Select the function that describes his distance from the finish line after x minutes.

A) f(x) = 1 over 4x + 4

B) f(x) = − 1 over 10x + 4

C) f(x) = 1 over 10x + 10

D) f(x) = − 1 over 4x + 10

Question

I need some help understanding how to work this problem, I got it wrong on a quiz. Can someone please help? 

A student is running a 10-kilometer race. He runs 1 kilometer every 4 minutes. Select the function that describes his distance from the finish line after x minutes.

A) f(x) = 1 over 4x + 4

B) f(x) = − 1 over 10x + 4

C) f(x) = 1 over 10x + 10

D) f(x) = − 1 over 4x + 10

mathwizzard3 · Answer

lets say it takes him 8, how would you figure it out?