John walked 10 miles on Saturday. He walked twice as fast on the second 5 miles of his walk than he walked on the first 5 miles of his walk. Which expression represents the time he spent walking? Let x = John's speed on the first half of his walk.

(1 point)
Responses

fifteen over x
Image with alt text: fifteen over x

five over three x
Image with alt text: five over three x

fifteen over two x
Image with alt text: fifteen over two x

ten over three x