A student is running a 5-kilometer race. He runs 1 kilometer every 3 minutes. Select the function that describes his distance from the finish line.

f(x) = - 1 over 3 x + 5

f(x) = - 1 over 5 x + 3

f(x) = 1 over 5 x + 5

f(x) = 1 over 3 x + 3

Question

A student is running a 5-kilometer race. He runs 1 kilometer every 3 minutes. Select the function that describes his distance from the finish line.

 f(x) = - 1 over 3 x + 5

 f(x) = - 1 over 5 x + 3

 f(x) =  1 over 5 x + 5

 f(x) =  1 over 3 x + 3

anonymous · Answer

if you can explain it that would be awesome!

anonymous · Answer

you mean $$\frac{ 1 }{ 3  }x $$?

anonymous · Answer

yeah over means that

anonymous · Answer

1/3x, 1/5x, 1/5x, 1/3x

anonymous · Answer

the first two are negative tho

anonymous · Answer

ok. than your answer is number one

anonymous · Answer

could you explain please?

tester97 · Answer

Use this link to help you http://openstudy.com/study#/updates/52755b35e4b09b78d9ee1e50

anonymous · Answer

yes, you run 1km in 3min. that's a speed of 1/3 km per min. You start at 5km and work your way back. that's why it's negative

anonymous · Answer

thanks!