David and Terri drove a small motorboat down a river with the current. The rate the boat traveled in still water was r miles per hour, and the current’s average speed was c miles per hour. It took them 1.5 hours to travel 4 miles downstream. Which of the following equations can be used to represent this information?
speed of boat r mi/hr speed of currect c mi/hr speed downstream (c+r) mi/hr but distance= 4miles time=1.5 hours thus speed=distance/time hence: 4/1.5=(c+r) thus 4=1.5c+1.5r hence the answer is: 4=1.5c+1.5r
