Q:
P is 30% more efficient than Q. How much time will they, working together, take to complete a job which P alone could have done in 23 days?
Answer & Explanation
Answer: B) 13 days
Explanation: Ratio of times taken by P & Q = 100 : 130 = 10:13
Let Q takes x days to do the work
Then, 10:13 :: 23:x
=> x = 23x13/10
=> x = 299/10
P's 1 day's work = 1/23
Q's 1 day's work = 10/299
(P+Q)'s 1 day's work = (1/23 + 10/299) = 23/299 = 1/13
Hence, P & Q together can complete the work in 13 days.
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