Question

Which rational function models the time, y, in hours, that it takes the train to travel between the two cities at an average speed of x miles per hour?

y= x/6.4
y= x/160
y= 6.4/x
y= 160/x​

Answer 1

y=160/x

Explanation:

other answer is wrong. i just did this question

Answer 2

`y=(x)/(6.4)`

Explanation:

The complete question in the attached figure

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form
`k=(y)/(x)` or
`y=kx`

In this problem, we have a proportional relationship between the average speed (x) and the time (y)

Find the constant of proportionality k

Fox =32, y=5

`k=(5)/(32)`

substitute

`y=(5)/(32)x`

we have

`(5)/(32)=(1)/(6.4)`

therefore

`y=(x)/(6.4)`