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The efficiency of work of P and Q are in the ratio 5 : 7. What will be the ratio of number of days taken by them to finish the work?
- A7 : 5
- B3 : 4
- C4 : 3
- D5 : 7
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CCommunity
We know that efficiency $(\propto {\rm{\;}}\frac{1}{{no\;of\;working\;days}})$
Given that efficiency of work P and Q are in the ratio of 5 : 7
∴ Ratio of number of days taken by them to finish the work = 7 : 5
Given that efficiency of work P and Q are in the ratio of 5 : 7
∴ Ratio of number of days taken by them to finish the work = 7 : 5