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An electric pump on the ground floor of ...

An electric pump on the ground floor of a building taken 10 minute to fill a tank of `45m^3` with water. The tank is `20 m` above the water level . If electric power consumed by the pump is `30kW` then efficiency of the pump will be ( density of water is `1000 kg/m^3`)

A

`33%`

B

`75%`

C

`50%`

D

`25%`

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