A train is traveling at a speed of 60 miles per hour. What statements are correct? Select all that apply. The number of miles the train travels causes a change in the number of hours. The number of hours causes a change in the number of miles the train travels. m, the number of miles, is the independent variable. h, the number of hours, is the dependent variable. m, the number of miles, is the dependent variable. h, the number of hours, is the independent variable.