a 32 oz bottle of water costs $1.92 what is the cost per ounce; $7.80/hour = ____ cents/minute?; what is the cost per unit of water; how to calculate cost per unit; a car is driving at a speed of 40 mi/h. what is the speed of the car in feet per minute?; write the conversion factor for seconds to minutes use the factor to convert 135 seconds to minutes; 16 oz water bottle