A suspect arrested in New Jersey is being turned over by New Jersey authorities to two New York City police officers for a crime committed in New York City. The New York officers receive their prisoner at a point miles from their precinct station house, and travel directly toward their destination at an average speed of 40 miles an hour except for a delay of 10 minutes at one point because of a traffic tie-up. The time it should take the officers to reach their destination is, most nearly