You travel 5 miles downstream in a kayak at a speed of r mph. You turned around and travels 6 miles upstream at a speed of 3/4r miles per hour. Finally, you turn around and return to your original starting point speed of r +1 mph A.) write a model in simplified form for the total time t( in hours) of the trip? B.) how long does your trip take when r is 5 mph (in hours and minutes)