If the train travels 744 miles in 3 hours then to determine the unit rate the train is traveling per hour you have to divide the miles by the hours, in this case (744 miles)/(3 hours). The final result concludes as 248 miles per hour.
By definition, the surface area of the sphere is given by: Where, r: sphere radio Clearing r we have: Substituting values: Then, the volume of the sphere is given by: Substituting values we have: Answer: the volume of the sphere is: