P is 30% more efficient than Q. P can complete a work in 23 days. If P and Q work together, how much time will it take to complete the same work?	Select the correct option.
A) 7 days	B) 8 days	C) 13	D) 5 days	E) 2days
Explanation :   Work done by P in 1 day = 1/23   Let work done by Q in 1 day = q   q × (130/100) = 1/23   =&gt; q = 100/(23×130) = 10/(23×13)   Work done by P and Q in 1 day = 1/23 + 10/(23×13) = 23/(23×13)= 1/13   =&gt; P and Q together can do the work in 13 days   ANSWER:13
<result>C</result>
P is 30% more efficient than Q. P can complete a work in 23 days. If P and Q work together, how much time will it take to complete the same work?