Create a class, traintravelcost, with the following characteristics:
•attributes of doubleduration, doubletrainfare, and string destination.
•a constructor that accepts and updates all the attributes
•normal accessors for duration and destination
•the getlodgingcost method returns: 0.0(passengers can sleep on the train)
•the gettotalcost method returns: travel fare+agent_fee
•a tostringmethod returns: "train travel to descriptionwill take durationand cost totalcost"formatted by string. format() see example below.