Trees are planted in a single straight line along a road, 5 m apart. A neem tree is the 12th tree from the north end and the 20th tree from the south end of the line. What is the distance between the first and the last tree of the line?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 150 m
The neem tree is counted from both ends, so trees in the line = 12 + 20 − 1. Between n trees in a line there are n − 1 gaps.
Trees in the line \(=12+20-1=31\)
Gaps between the first and the last tree \(=31-1=30\)
Distance \(=30\times5=150\,\mathrm{m}\)
