A. 48 days
B. 24 days
C. 40 days
D. 36 days
✅ The correct answer is option D. 36 days.
No. of days is
No. of days is
directly proportional to the length of the wall and
inversely proportional to the number of men No. of days = (1200/500)*(15/30)*30 = 36 days