P can do a certain work in 10 days. Q is 60% more efficient than P. How many days does Q alone take to do the same job?  Choose the correct choice from the following answers
A) 6.25  B) 6.75  C) 7.5  D) 7.75  E) 8.25
Each day, P can do 1/10 of the work.   Each day, Q can do 1.6/10 of the work = 16/100 of the work   The time taken by B alone to complete the total work is   100/16= 
<gadget id="calculator">  100/16</gadget>
<output>25/4 = around 6.25</output>
6.25 days.   The answer is 6.25.
<result>A</result>
P can do a certain work in 10 days. Q is 60% more efficient than P. How many days does Q alone take to do the same job?