• # question_answer Two pipes A and B can fill a tank in 20 and v minutes respectively. If both the pipes are used together, then how long will it take to fill the tank A) 12 min.            B) 15 min.C) 25 min.            D) 50 min.

Correct Answer: A

Solution :

Required time to fill the tank $=\frac{20\times 30}{20+30}$ $=\frac{600}{50}$ $=12\,\,\min$

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