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Mathematics textbook of Beijing Normal University, question bank for top students, Volume 6, page 5/kloc-0, how to write the fifth question?
4320 divided by 10=432 (meters), which is the original work efficiency.

4320 divided by 40%= 10800 (m) This is the total workload.

10800-4320=6480 (m) This is the remaining workload.

432 times (1+25%)=540 (meters), which is the current working efficiency.

6480 divided by 540= 12 (days) means that the rest will be completed in 12 days.