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A job takes A 30 days. A and B together do it in 20 days. What is the ratio of A's work rate to B's?

Class 8Time and WorkDirect and Inverse Proportions

A1 : 2
B3 : 2
C2 : 3
D2 : 1

Step-by-Step Solution

A = \frac{1}{30}

;

B = \frac{1}{20} - \frac{1}{30} = \frac{1}{60}

. Ratio

\frac{1}{30} : \frac{1}{60} = 2 : 1

. A is the faster worker.

Answer: D) 2 : 1

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