A boater drove a motorboat upstream a distance of 46 miles and then immediately drove back to the starting point.  The total time of the trip was 3.5 hours.  If the rate of the current was 4 mph, how fast would the boat have traveled in still water?

A boat traveled downstream a distance of 55 mi and then came right back. If the speed of the current was 8 mph and the total trip took 3 hours and 40 minutes, find the average speed of the boat relative to the water.

a motorboat traveling with the current went 24 miles in 2 hours. against the current, it took 3 hours to travel the same distance. find the rate of the boat in calm water and the rate in current.

A boat traveled miles downstream and back. The trip downstream took hours and the trip back took hours. What is the speed of the boat in still water? What is the speed of the current?