Two pipes A and B together can fill a tank in 18 hours. If A alone takes 1/2 of the time of thrice B’s time,
then the t

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1. Answer:

   1. Then (A + B)’s 1 hour’s work = 1/18. Therefore, 1/18 = 1/X + 2/3X. X = 30. Hence, B takes 30 hrs to fill the tank alone.

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