Formula Used:
M1 * D1 = M2 * D2, where:
M1 = Number of men initially (18)
D1 = Number of days initially (13)
M2 = Number of men later (54)
D2 = Number of days later (unknown)
Solution:
M1 * D1 = M2 * D2
18 * 13 = 54 * D2
D2 = (18 * 13) / 54
D2 = 13/3 days
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