Why is the fire engine red?

A fire engine has a ladder.

A ladder has 12 rungs and each one is 12 inches apart.

12 inches make a foot.

A foot can be ruler.

A ruler can be King or a Queen.

Queen can be Queen Elizabeth.

Queen Elizabeth is the name of a ship.

Ship sails in water & Fish live in water.

Fish have fins.

People from Finland are called Fins.

Fins love apples.

Apples are red in colour.

So is the fire engine.