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A farmer connects a pipe of internal diameter 20 cm from a canal into a cylindrical tank in her field, which is 10 m in diameter and 2 m deep. If water flows through the pipe at the rate of 3 km/h, in how much time will the tank be filled?

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Volume rate of water flow=A*3km/h
=`pi(10)^2*3*10^3m^3/h`
=`3pim^3/h`
time *Volume rate=Volume filled in that time
`t*3pim^3/h=50pim^3`
`t=16hrs`

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