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If A can fill the tank in 10 days and B ...

If A can fill the tank in 10 days and B can fill the same tank in 20 days and C can empty the same tank in 30 days . find how many days tank will full if all three work together.

A

7/65 days

B

65/7 days

C

7/60 days

D

60/7 days

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