The equation shown above represents the following scenario: A chemical laboratory uses two air purifiers to clean the air of contaminants emitted while working with hazardous materials. One is an older model, and the other is a new model that is considerably more energy efficient. The new model can clean the air of contaminants three times as quickly as the older model. Working together, the two air purifiers can clean the air in the lab in 7 hours. Which of the following describes what the term in the equation represents?
A. The portion of the air the new model can clean in 1 hour
B. The portion of the air the older model can clean in 1 hour
C. The time it takes the older model to clean the air by itself
D. The time it takes the older model to clean of the air by itself
Answer:B
The equation shown above represents the following scenario: A chemical laboratory uses two air purifiers to clean the air of contaminants emitted while working with hazardous materials. One is an older model, and the other is a new model that is considerably more energy efficient. The new model can clean the air of contaminants three times as quickly as the older model. Working together, the two air purifiers can clean the air in the lab in 7 hours. Which of the following describes what the term in the equation represents?
A. The portion of the air the new model can clean in 1 hour B. The portion of the air the older model can clean in 1 hour C. The time it takes the older model to clean the air by itself D. The time it takes the older model to clean of the air by itself
Explanation: B