180 metres long yard, 11 trees are palnted at equal distances, one tree being at each end of the yard. What is the distance between 2consecutive trees Choose the correct option
A) 18  B) 12  C) 14  D) 16  E) 17

Rationale: "11 trees have 10 gaps between them , required distance ( 180 / 10 ) = 18 a"
Answer: A