Noelle walks from point a to point b at an average speed of 5 kilometers per hour. at what speed, in kilometers per hour, must noelle walk from point b to point a so that her average speed for the entire trip is 6 kilometers per hour?

the speed at which Noelle walks from point B to A, v=7.5 kilometers per hour

Explanation:

In this question we have given

average speed for the entire trip,S = 6 kilometers per hour

Speed of Noelle while walks from point A to B= 5 kilometers per hour

Therefore, time taken by Noelle to walks from point A to B,

Let us consider distance between A and B is d.

Therefore total distance covered in moving from point A to B and then moving back from point B to A, =

Let v be the speed at which Noelle walks from point B to A

Therefore time taken by Noelle to walks from point B to A,

we know that average speed S is given as

................(1)

here, x (=2d) is total distance

and t (= ) is total time

put values of S, x and t in equation 1

on solving we get,

v = 7.5 kilometers per hour

Therefore, the speed at which Noelle walks from point B to A, v=7.5 kilometers per hour

it is b

explanation:

object 2 because all the other ones are wrong