P can do a certain work in 9 days. Q is 60% more efficient than P. How many days does Q alone take to do the same job? Pick one
A) 60/9 B) 45/8 C) 30/7 D) 25/6 E) 18/4
Each day, P can do 1/9 of the work.   Each day, Q can do 1.6/9 of the work = 16/90 of the work   The time taken by B alone to complete the total work is 90/16 = 45/8 days.   The answer is 45/8.
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P can do a certain work in 9 days. Q is 60% more efficient than P. How many days does Q alone take to do the same job?