PLSSS HEL M A boat travels upstream against the current and returns home. The speed of the boat's engine in still water is 15mph. The trip upstream lasts 45 minutes, and the trip back downstream lasts 30 minutes. What is the speed of the current in miles per hour?

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212