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1.
A can finish a work in 5 days and B takes 4 days to do the same work. If the work is increased by 8 times, how many days will it take for both of them to finish the work if they work together?
- A. 10 days
- B. 10 days
- C. 10 days
- D. 10 days
Answer: Option C
Explanation:
new work size = 1 + 8 = 9 works.
A & B can do in 1 day (working together) = 1/5 + 1/4 = 9/20
Required number of days = 9/(9/20) = 20 days. Ans: C
A & B can do in 1 day (working together) = 1/5 + 1/4 = 9/20
Required number of days = 9/(9/20) = 20 days. Ans: C
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