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1. A man can do a piece of work in 5 days. But with the help of his son, he can do it in 3 days . In what time can the son do it alone ?
- A. 6.5 days
- B. 6.5 days
- C. 6.5 days
- D. 6.5 days
Answer: Option C
Explanation:
Man completes total work in 5 days, he will do one fifth of work in day and along with son will do one third of work in day. So son alone can complete the work in 7.5 days as explained below
Work done by man in a day : 1/5
Work done by man + son in a day : 1/3
Work done by son in a day : 1/3 - 1/5 = 2/15
Time take by son to complete work : 15/2 or 7.5 days
ans: 7.5 days
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