Electric poles stand in a single straight line along a canal, 25 m apart. One pole is 11th from the north end and 14th from the south end of the line. What is the distance between the first and the last pole of the line?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 575 m
The pole is counted from both ends, so poles in the line = 11 + 14 − 1. Between n poles in a line there are n − 1 gaps.
Poles in the line \(=11+14-1=24\)
Gaps between the first and the last pole \(=24-1=23\)
Distance \(=23\times25=575\,\mathrm{m}\)
