A and B together can complete a task In 20 days. B and C together can – McqOptions

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1.	A and B together can complete a task In 20 days. B and C together can complete the same task in 30 days. A and C together cart complete the same task in 40 days. What is the respective ratio of the number of days taken by A when completing the same task alone to the number of days taken by C when completing the same task alone?
A.	2:5
B.	2:7
C.	3:7
D.	1:5
Answer» C. 3:7

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