When two pumps are used, they can fill a tank in 60 minutes. When the first pump is used alone, the tank will be filled in 150 minutes. When x represents the time it takes the second pump to fill the tank when used alone, the situation is represented by this equation: 1 60 10+ = 60- How long would it take the second pump, working alone, to fill the tank? OA 75 minutes B. 90 minutes OC. 100 minutes O D. 120 minutes