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A man is standing on a railway bridge which is 180 m long. He finds that a train crosses the bridge in 20 seconds but himself in 8 seconds. Find the length of the train

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Water flows at the rate of 10 m per minutes through a cylindrical pipe 5mm in a diameter. how long would it take to fill a conical vessel whose diameter at the surface 40 cm and depth 24 cm?
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