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A tank is 7 metre long and 4 metre wide....

A tank is 7 metre long and 4 metre wide. At what and speed should water run through a pipe 5 cm broad and 4 cm deep so that in 6 hours an 18cmminutes water level in the tank rise by 4.5 metre? `10\ k m//h r` b. `12\ k m//h r` c. `8\ k m//h r` d. none of these

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