Tim and a friend left a campsite on a trip down a river in a canoe, maintaining a constant speed of 4 mph. Four hours later, Tim's father set out after them in a motorboat carrying the camping supplies. The motorboat traveled at a rate of 12 mph. How long after he started did Tim's father overtake the Boys? How far from the campsite were they at the time.

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.