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1. A man can do a job in 15 days. His father takes 20 days and his son finished it in 25 days. How long will they take to complete the job if they all work together?
- A. Less than 6 days
- B. Less than 6 days
- C. Less than 6 days
- D. Less than 6 days
Answer: Option D
Explanation:
Together in 1 day they can do
= ( 1/15 + 1/20 + 1/25) portion
= 47/300 portion
47/300 portion is done in 1 day
1 full portion dine in 300/47 day = 6.38297873 = 6.4
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