The data below are taken from a test of a petrol engine for a motor car.
power output: 150 kW
fuel consumption: 20 litres per hour
energy content of fuel: 40 MJ per litre
Which expression will evaluate the efficiency of the engine?
1 )
$\frac{{150 \times {{10}^3}}}{{40 \times {{10}^6} \times 20 \times 60 \times 60}}$
$\frac{{150 \times {{10}^3} \times 60 \times 60}}{{20 \times 40 \times {{10}^6}}}$
3 )
$\frac{{150 \times {{10}^3} \times 40 \times {{10}^6} \times 20}}{{60 \times 60}}$
4 )
$\frac{{150 \times {{10}^3} \times 20}}{{40 \times {{10}^3} \times 60 \times 60}}$
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