P and Q can do a work individually in 15 days and 20 days respectively. Find the respective ratio of their efficiencies.

P and Q can do a work individually in 15 days and 20 days respectively

1.	P and Q can do a work individually in 15 days and 20 days respectively. Find the respective ratio of their efficiencies.
A.	4 : 3
B.	3 : 4
C.	4 : 5
D.	5 : 4
Answer» B. 3 : 4

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P and Q can do a work individually in 15 days and 20 days respectively. Find the respective ratio of their efficiencies.

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