Physics help with efficiency

[tysajdak]

Homework Statement

I am using a 5 kilowatt motor to pump oil to a holding tank which is 20 m above the pump. If the motor is 65% efficient, how many liters of oil can i pump per minute if 1 liter of oil has a mass of 1.30 kg?

Homework Equations

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The Attempt at a Solution

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[rock.freak667]

The Attempt at a Solution

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Well if the efficiency is 65% how much is the work output of the motor?

 

[SteamKing]

How much energy does it take to lift 1 liter of oil 20 meters? After accounting for the efficiency of the motor, how much energy per minute is furnished to the pump?