A ship consumes 512 litres of fuel to cover a distance of km, and another ship consumes 855 litres of the same fuel to cover a distance of km. Which ship consumes less fuel?
Step 1: Find the rate at which the first ship consumes fuel.
Step 2: Find the rate at which the second machine consumes fuel.
Step 3: Compare the rates. The machine with the smaller rate consumes less fuel.
So, the second machine consumes less fuel.