Reposting see if someone else comes up with a different answer.

Question

Amy wants to travel from Elm town to Lakeside at an average speed of 50 miles per hour. She travels half the distance and discovers that her average speed has only been 25 miles per hour. How fast must she drive for the remaining part of the trip if she is to average 50 miles per hour for the entire trip?

Answer 1

Trick question.
She travelled half the distance in 1 hour. ( time = distance/rate = 25 miles/(25 mph) = 1 hr)

To average 50 mph for the entire 50 miles would take 1 hour.
Amy has already used up all her time, can't be done

Answer 2

Here was Scott's answer.

"scott Monday, May 7, 2018 at 8:09pm
let's call the distance d

so the desired time for Amy's trip is ... d / 50

her time at the halfway point is ... (d / 2) / 25 , which equals ... d / 50

she has run out of time to achieve her desired average speed

Answer 3

I figured it just wasn't a possible answer. SORRY
Should have realized a bonus problem is sometimes a trick problem.
Sorry I wasted your time