a train travels 325 km in 3.5 hours and 470 km in 4 hours . find the average speed of train ?
explanation : as we know that speed = distance / time for average speed = total distance / total time taken thus , total distance = 325 + 470 = 795 km thus , total speed = 7.5 hrs average speed = 795 / 7.5 = > 106 kmph . answer : b
divide(add(325, 470), add(3.5, 4))