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Let's break down the problem to find the solution.

1. The airplane's cruising speed is 120 miles per hour.
2. It burns 8 gallons of fuel per hour.
3. The airplane covered 180 miles at cruising speed.

### Step-by-step calculation:
- First, calculate how many hours it took for the airplane to cover 180 miles at 120 miles per hour:
  
  \[
  \text{Time} = \frac{\text{Distance}}{\text{Speed}} = \frac{180 \text{ miles}}{120 \text{ miles/hour}} = 1.5 \text{ hours}
  \]

- Now, calculate how many gallons of fuel it used in 1.5 hours. Since it burns 8 gallons per hour:

  \[
  \text{Fuel used} = 8 \text{ gallons/hour} \times 1.5 \text{ hours} = 12 \text{ gallons}
  \]

Thus, the airplane used **12 gallons of fuel**.

The correct answer is **12**.

Do you want more details or have any questions?

Here are 5 related questions to explore:
1. How much fuel would be used if the airplane flew 300 miles?
2. What would be the fuel consumption if the speed was 150 miles per hour instead?
3. If the fuel consumption rate increased to 10 gallons per hour, how many gallons would be needed for the same 180-mile trip?
4. How far could the airplane travel if it had only 16 gallons of fuel?
5. What is the relationship between speed, time, and fuel consumption in this scenario?

Tip: When solving fuel or distance problems, always calculate time first using distance and speed!

At a cruising speed of 120 miles per hour, an airplane burns 8 gallons of fuel per hour. If the airplane covered 180 miles at cruising speed, how many gallons of fuel did it use?

Learn how to calculate the fuel consumption of an airplane traveling at a cruising speed of 120 miles per hour, burning 8 gallons of fuel per hour over a 180-mile trip. This problem involves rate problems and basic arithmetic, suitable for students in Grades 5-7.

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