Toss Up - Physics - Multiple Choice

A ladder is moving at .6c, and its length is oriented parallel to its motion. In its reference frame, the distance between each rung is 50 centimeters. A stationary observer would note that the distance between each rung is actually
W) 25 centimeters
X) 30 centimeters
Y) 40 centimeters
Z) 60 centimeters