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Question

Water flows along a pipe of radius 0.6cm at 8cm per second. This pipe is draining the water from a tank which holds 1000 litres of water when full. How long would it take to completely empty the tank ?

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Solution

1 litre = 1000 cm3
volume of tank = 1000000 cm3
volume of water flowing out of the pipe per second = πr2l
where r is the radius of the pipe and l is the flow per second
r=0.6cm and l=8cm/s
substituting the values we have volume of water flowing out of the pipe per second = 9.0477cm3/s
time taken to empty tank = volumeoftankvolumeofflowingoutthroughthepipepersecond =10000009.0477 =110525.32seconds
i.e 30.7 hours.

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