During a trip, amy had to take two different trains. her first train traveled for 3 hours, and the second train traveledfor 4 hours. combined, the trains traveled 625 miles. if the equation 3m + 4n = 625 represents this situation, which statements are true regarding this equation? select two that apply. the variable n in the equation represents the speed of the first train. the variable n in the equation represents the speed of the second trainthe variable m in the equation represents the number of hours amy traveled on the first trainthe variable m in the equation represents the speed of the second train. the variable m in the equation represents the speed of the first train. the variable n in the equation represents the number of hours amy traveled on the second train.