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?
9
11
13
15
A
11
B
13
C
15
D
9
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Solution
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Work done by P in 1 day=123
Let work done by Q in 1 day=q
q×130100=123
⇒q=10023×130=1023×13
Work done by P and Q in 1 day=123+1023×13=2323×13=113
∴P and Q together can do the work in 13 days.
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