A car is traveling at 33 mph. If its tires have a diameter of 26 inches, how fast are the car's tires turning? Express the answer in revolutions per minute. If necessary, round to the nearest hundredth. To approximate the speed of a river, a circular paddle wheel with radius 0.68 feet is lowered into the water. If the current causes the wheel to rotate at a speed of 14 revolutions per minute, what is the speed of the current? Express the answer in miles per hour rounded to two decimal places, if necessary.