Chapter 4

NCERT
Class 9
History
Solutions
1. Each mile of railway track required between 1,760 and 2,000 sleepers. If one average sized tree yields 3 to 5 sleepers for a 3 metre wide broad gauge track, calculate approximately how many trees would have to be cut to lay one mile of track.

Question:

Each mile of railway track required between 1,760 and 2,000 sleepers. If one average sized tree yields 3 to 5 sleepers for a 3 metre wide broad gauge track, calculate approximately how many trees would have to be cut to lay one mile of track.

Answer:

Average number of sleepers required per mile

= 1760 + 2000/2

= 1880 sleepers

Average number of sleepers obtained from one tree = 4

Therefore, approximate number of trees to be cut

= 1880/4 = 470 trees

Buy Latest Books

Teacher's Corner