Question

There are 6 short pieces of link chain, each having 4 links. It takes

10 seconds to cut a link and 25 seconds to weld it back together.

What is the shortest possible time to make the longest chain?

(A) 175 seconds (B) 210 seconds

(C) 150 seconds (D) 60 seconds

Answer 1

I think (c) 150 seconds