A tank can be filled with water by two pipes A and B together in 36 minutes, the tank is filled in 40 minutes. The pipe B can alone fill the tank in -

A tank can be filled with water by two pipes A and B together in 36 minutes, the tank is filled in 40 minutes. The pipe B can alone fill the tank in - Correct Answer 90 munutes

Let the pipes fill the tank in x minutes. Part of the tank filled by pipes A and B in one minute: 1/36 Part of the tank filled by pipe A in 1 minute = 1/36−1/x According to the question, 30 × (1/x) + (1/36−1/x) = 1 ⇒30x + 10/9−40/x = 1 ⇒10/x = 1/9 Hence, x = 90 minutes.
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