A Stretch of Land Is 12

Short Answer

A stretch of land is 12.5 km long on a map.
(a) What would be its length to an observer moving by, parallel to the stretch, at 0.9500c?
(b) Which is the proper length for this stretch of land?
(c) How fast relative to Earth would the observer have to move for the land to appear 6.50
km long? Express your answer in terms of the speed of light.