To find the speed with given distance and time you just have to divide the distance by time. In this situation it's 396 miles in 6 hours, so it's 396 / 6 = 66 miles in 1 hour. So the speed is 66 mph .
To find the speed, use the formula v = t d . Given 396 miles and 6 hours, the speed calculates to 66 miles per hour, or approximately 106.2 kilometers per hour in SI units.
;