A 17 ft ladder is leaning against a wall and sliding towards the floor. The foot of the ladder is sliding away from the base of the wall at a rate of 3 ft/sec. How fast is the top of the ladder sliding down the wall when the top of the ladder is 8 ft from the ground?

• A. 458 ft/sec
• B. 558 ft/sec
• C. 398 ft/sec
• D. 452 ft/sec