A certain train preparing to leave the station blows its whistle. Sound travels at 343 m/s in dry air. How many seconds will it take for the sound to reach the first crossing, which is 2.50×103 feet away

The graph indicates the running route for tobias. which best describes his run? from time 0 to 6, he went fast and then slowed down. from time 6 to 10, he was at his slowest. from time 12 to 14, he went very slow. from time 14 to 18, he went toward the starting point.