Question

At a speed of 50 miles per hour, a certain car uses 1 gallon of gasoline every 30 miles. if the car starts with a full 12 gallon tank of gasoline and travels for 5 hours at 50 miles per hour, the amount of gasoline used would be what fraction

Answer 1

1 gallon = 30 miles

5 hours = 250 miles
$250 \div 30 = 8 \frac{1}{3}$
Fraction of amount of gasoline used =
$\frac{ \frac{25}{3} }{12} \\ = \frac{25}{3} \times \frac{1}{12} \\ = \frac{25}{36}$
Answer is 25/36

Hope this helps. - M