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I am having a bit of a problem solving the following question (not good with maths), and would be very grateful for any advice given.

## Homework Statement

A car is run for 400 hours per year, with a total mileage of 10,000 a year. The car uses diesel and consumes 2,000 litres per year. A litre of diesel cost £1.10 and holds 38.7MJ of primary energy.

a) Calculate the mean engine power?

b) If the engine is 20% efficient overall, how much energy would need to be stored in 95% efficient batteries to give a range of 300 miles on full battery charge?

Many thanks,