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Answer : 2 29.39 cm Explanation : Answer: B) 29.39 cm Explanation: Volume of water flowing through 1 pipe of diameter x = Volume discharged by 6 pipes of diameter 12 cms. As speed is same, area of cross sections should be same.  Area of bigger pipe of diameter x = Total area of 6 smaller pipes of diameter 12 i.e πR2 = 6πR12   Here R = R and R1 = 12/2 = 6   ⇒R2 = 6×6×6   R = 14.696   =