A cylindrical pipe has inner diameter of 7cm and water flows through it at 192.5 litres per minute. Find the rate of flow in kilometers per hour.
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Solution
We have
Volume of water that flows per hour =(192.50×60)litres=(192.50×60×1000)cm3.....(i)
Inner diameter of the pipe =7cm
Inner radius of the pipe =72cm=3.5cm
Let h cm be the length of the column of water that flows in one hour Clearly, water column forms a cylinder of radius 3.5cm and length h cm Volume of water that flows in one hour = volume of the cylinder of radius 3.5cm and length h cm