18:20
Multiply each side by 2
Check the attached file and let me know what you think.
Answer:
11 gallons of gas is needed to travel 231 miles.
Step-by-step explanation:
We can set up a proportion for this problem.
<em>For every 62 miles, you use 3 gallons of gas. </em>

Now, let's cross multiply.
≈ 
So, you will need about 11 gallons of gas to travel 231 miles.
You can do prime factorization then find common factors to factor out.
6m² - 15m
2·3·m·m - 3·5·m
Both terms have 3·m so we can factor it out:
3·m (2·m - 5)
So that would be 3m (2m - 5)