Water flows in a streamline motion through a horizontal pipe of circular cross-section as shown in the figure. The pressure difference of water between P and Q is 15 N m -2 . The area of cross-section at P and Q are 40 cm 2 and 20 cm 2 respectively. The rate of flow of water through the pipe, in cm 3 s -1 , is: [Take density of water =1000 kg m -3 ]

1. A. 100
2. B. 200
3. C. 300
4. D. 400

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