Question

‘P’ alone can do 60% of a work in 18 days and ‘Q’ alone can do 30% of the same work in 9 days. ‘P’, ‘Q’ and ‘R’ together can finish the work in 10 days. The efficiency of ‘Q’ is what percent of the efficiency of ‘R’?

A 100%
B 120%
C 180%
D 220%
E None of these
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