NCERT

Class 9

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Solutions

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.

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

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