Atrain travels at a constant speed of 35 mi/h. how long does it take the train to travel 490 mi?

14 hours . Just divide 35 into 490 & ypu get 14

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.