Jim has two passengers in his car,one is in the front and the other in the back.When they arrive at their destination,they meet up with four others. As they all get out,it starts to rain heavily.Six of them start walking fast but still get wet.However,the passnger from the back of Jims car remains completely dry,even though he makes no attempt to hurry and is wearing no hat,coat or using an umbrella.How is this posible?