Pedro is a well-known carpenter in his neighborhood. One morning, he cut the 25m electric wire into two parts in such a way that the sum of their reciprocals is 1/6. What quadratic equation can be derived from the given problem?
a. 1/x + 1/x-25 = 1/6
b. 1/x + 1/25-x = 1/6
c. 1/6 + 1/x = 1/25-x
d. 1/6 + 1/25-x = 1/x