220 metres long yard, 21 trees are palnted at equal distances, one tree being at each end of the yard. What is the distance between 2 consecutive trees  Options: A) 10 B) 12 C) 14 D) 11 E) 17
21 trees have 20 gaps between them,   Required distance (220/20)= 
<gadget id="calculator">(220/20)</gadget>
<output>11</output>
11   11
<result>D</result>
220 metres long yard, 21 trees are palnted at equal distances, one tree being at each end of the yard. What is the distance between 2 consecutive trees