https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwi__9fAr-_nAhUCXM0KHfeZCjUQFjAAegQIBBAB&url=https%3A%2F%2Fwww.chegg.com%2Fhomework-help%2Fchapter-7-discussed-white-water-rapids-view-change-refers-si-chapter-10-problem-7rdq-solution-9780133063134-exc&usg=AOvVaw250ZFycO3xBwV9MIhUPEXX