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The quantity of water which flows through a pipe is proportional to the square of its diameter. If a pipe of 5 cm diameter

The quantity of water which flows through a pipe is proportional to the square of its diameter. If a pipe of 5 cm diameter can fill a tank in 1min. How long would 3 pipes of 3cm, 4cm and 5cm diameter together take to fill it? 1. 2 min. 2. 1.5 min. 3. 1 min. 4. 30 sec 5. None of these

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