11. 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 the walk.
a) 15/x
b) 5/3x
c) 15/2x
d) 10/3x

On traditional maps, earth is represented in a flat plane, or by euclidean geometry. however, a globe is a more accurate model that comes from elliptical geometry.how does a globe represent the fact that there are no parallel lines in elliptical geometry? the equator is not parallel to any other latitudinal lines. the north and south poles are never connected by a geodesic. the geodesics connecting the north and south poles never intersect. the geodesics connecting the north and south poles intersect at both of the poles.