Choose the word which is different from the rest.

The answer is E, kilometres. The other options are all units of mass, while kilometres is a unit of length.

• A tonne is a unit of mass equal to 1000 kilograms.
• A quintal is a unit of mass equal to 100 kilograms.
• A gram is a unit of mass equal to 0.001 kilograms.
• A kilogram is a unit of mass equal to 1000 grams.