Question

Need help D: see attachment

Answer 1

Efficiency= power output/power input

Here, the power input would be 20MJ times 20 litres times (60 x 60). This is because the power output is given by 150kW which means 150kJ of energy per second is produced.
So 20 litres of fuel provides (20 x 20MJ x (60 x 60)) power input.

Answer 2

Thanks alot :3!