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A can do a work alone in 20 days. A and ...

A can do a work alone in 20 days. A and B together can do the same work in 15 days. B and C together can do the same work in 752 days. What is the ratio of efficiency of A, B and C in terms of working?
A किसी कार्य को अकेला 20 दिनों में कर सकता है | A तथा B मिलकर उसी कार्य को 15 दिनों में कर सकते हैं |B तथा C मिलकर उसी कार्य को `75/2` दिनों में कर सकते हैं | कार्य करने की दृष्टि से A, B तथा C की दक्षता का अनुपात कितना है?

A

`5:3:1`

B

`10:4:1`

C

`5:4:3`

D

`15:5:3 `

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