A vehicle travels 2345 m in 315 s toward the evening sun. What is its velocity?

The velocity, in meters per second, is simply 2345/315, which simplifies to 67/9 (can also be written as 7 4/9 or 7.444 ...)

in order to translate this into kilometers per hour, multiply the number by 3.6 (3600 seconds / 1000 meters = 3.6)