A tank can be filled by a pipe in 20 min. and by another... — Answer & Explanation | PrepBeePakistan

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MEDIUMENGLISHMathematics

A tank can be filled by a pipe in 20 min. and by another pipe in 60 min. Both the pipes are kept open for 10 min. and then the first pipe is shut off. After this, the tank will be completely filled in__________?

Correct answer: B

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