Its traveling at the speed of 153818 kmhr. If you know the value of this fields potential difference you can calculate the speed or velocity of an electron moving under its influence. What kind of quantity is velocity.
V f 2 D x t v i.
In a physics equation given a constant acceleration and the change in velocity of an object you can figure out both the time involved and the distance traveled. To calculate that divide 33 seconds into 3600 seconds one hour and then multiply that quotient by 141 km to get kmhr. Is 20 981 T unit. Its traveling at the speed of 153818 kmhr.