Answers

2014-09-09T22:34:24+08:00
1280 meters apart from the first pole to the last
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2014-09-09T23:44:10+08:00
Distance from first pole to the last =  80* 15 = 1200m
let say there are 3 poles at 80m apart
distance from first pole to last pole = 80* 2 =  160
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