A ladder 20 ft long leans against a vertical wall. The top end slides downwards at the rate of 2 ft per second. The rate at which the lower end moves on a horizontal floor when it is 12 ft from the wall is
(A) 8/3
(B) 6/5
(C) 3/2
(D) 17/4
The correct option (A) 8/3
Explanation:
