Question:
If 45 persons can complete a work in 20 days, then the time taken by 75 persons will be ______ hours.
Solution:
45 persons complete a work in 20 days
1 person can complete work in = 45 × 20 = 900 days
Time taken by 75 persons = 900/75 = 12 days = 12×24 = 288 hr